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Pvodn vedeck prce v karentovanch asopisoch
  1. GROEK,O.-SATKO,L.: A new notion in Semigroups theory, Semigroup Forum 20 (1980), 233-240.
  2. GROEK,O.-SATKO,L.: On minimal A-ideals in Semigroups, Semigroup Forum 23 (1981), 283-295.
  3. GROEK,O.-SATKO,L.: Smallest A-ideals in Semigroups, Semigroup Forum 23 (1981), 297-309.
  4. GROEK, O. - NEMOGA, K. - SATKO, L.: A Remark to Luby-Rackoff and Ueli M.Maurer Pseudorandom Generators. In: Tatra Mountains Mathematical Publications. - Ro. 20, (2000), s. 113-120.
  5. GROEK, O. - NEMOGA, K. - SATKO, L.: Generalized Perfectly Nonlinear Functions.- TATRA MOUNTAINS Math. Pub.20, (2000), s. 121-131.
  6. GROEK,O.-SATKO,L.-NEMOGA, K- HERRERA, S: A sharp proof of unicity distance for Markoff sources. TATRA MOUNTAINS Math. Pub. 25(2002), pp. 81-90.
  7. GROEK,O.-SATKO,L.-NEMOGA, K: Extremal properties of generalized S-boxes. COMPUTING AND INFORMATICS, Vol. 22, 2003, 85-99.
  8. GROEK,O. IKA,J.: Semigroup of matrices over GF(2s) and its relation to AES. COMPUTING AND INFORMATICS, Vol. 22, 2003, 417-426.
  9. GROEK,O., HORK, P., TRUNG van TRAN.: On non-polynomial Latin squares. DESIGN, CODES AND CRYPTOGRAPHY, Vol. 32, 2004, 217-226.
  10. O. GROEK, J. IKA: Discrete logarithm problem in GH and XTR scheme. TATRA MOUNTAINS MATH. PUBLICATION, 29 (2004) 123-135.
  11. O. GROEK, M. MILLER and J. RYAN: On non-polynomiality XOR over Z_{2^n}. TATRA MOUNTAINS MATH. PUBLICATION, 29(2004), 183-191.
  12. O. GROEK, S. MAGLIVERAS, J. APUKA a WANDI WEI: Is Rijndael really independent of the field polynomial? TATRA MOUNTAINS PUBLICATION, 33(2006), 51-69.
  13. O. GROEK, P. HORK, P. ZAJAC: Efficient Mixing Transformations for Block Ciphers. Zaslan do Discrete Mathematics, 14 strn.


Pvodn vedeck prce v recenzovanch nekarentovanch asopisoch
  1. GROEK,O.: Topologija na polugruppach inducirovannaja endomorfizmom, Math.Slovaca 2 (1978), 217-223.
  2. GROEK,O.: Entropija na algebraieskych strukturach, Math.Slovaca 4 (1979), 411-424.
  3. GROEK,O.-SATKO,L.: Greatest A-ideals in Semigroups, Proceedings of the Szeged conference (1981), North-Holland Publications, Colloquia Mathematica Soc.Jnos Bolyai, 389-395.
  4. GROEK,O.-KADSI,.-FERK,V: A simple approximation to the bivariate normal integral and its application to multifactorial treshold genetic traits, AFRNUC - Genetica et Biologia Molecularis 22 (1991), 47-55.
  5. GROEK,O.-STEISKALOV,E.: How to improve Alternative Adaptation Algorithms, Elektrotechnick asopis 41 No.9, (1990), 684-695.
  6. GROEK,O.-JAJCAY,R.: Generalized difference sets on infinite cyclic semigroup, Journal of Combinatorial Math.and Comb. Computation 13 (1993), 167-174.
  7. SATKO,L.-GROEK,O.: On SLA ideals, Mathemtica Slovaca 45 (1995), No.1, 45-52.
  8. GROEK,O.: Remarks concerning RSA-cryptosystem exponent, Mathematica Slovaca 44 (1994), No.2, 279-285.
  9. GROEK,O.: On a Reconstruction of a Markov Chain. Journal of Combinatorics, Information & System Sciences 20 (1995), No. 1-4, 85-93.
  10. GROEK,O., WANDI WEI: Bent-like functions on groupoids, PU.M.A. Vol. 10(1999), NO.3, pp. 267-278.
  11. GROEK,O., VALLO,D.: Remark to J. van Tilburg Attack on the McEliece Public-Key Cryptosystem, Elektrotechnick asopis, 49 (1998), No.9-10, pp.255-258.
  12. GROEK,O.-NEMOGA,K.-SATKO,L.: Remarks to short RSA public exponents, Annales Mathematicae Silesianae 12 (1998), pp. 65-74.
  13. GROEK,O., NEMOGA,K., SATKO,L.: Composed modulus for RSA algorithm, Journal of ELECTRICAL ENGINEERING, 50 (1999), No.5-6, pp.141-142.
  14. GROEK, O., SATKO, L., NEMOGA, K.: Cryptology. In: Begabtenfrderung im MINT-Bereich. Band 3. Ulm: Aegis-Verlag, 1999. - s. 7-29.
  15. GROEK, O.- IKA, J.: Signature schemes based on matrices. Congressus Numernatium (2002), 154-159.
  16. GROEK,O.-NEMOGA,K.-ZANECHAL,M.: Why use bijective S-boxes in GOST-algorithm, submitted to CSI, 13 strn, august 2002.
  17. GROEK O., RMKA M.: Efficiency of the Elliptic Curve Cryptosystems. JEEE, VOL.54, NO 12/s, 2003, pp. 10-14.
  18. SS, M., GROEK, O.: A new DL problem. JEEE, VOL. 56, NO 12/s, 2005, pp. 119-122
  19. GROEK, O., ZAJAC, P.: Graphs connected with block ciphers. WSEAS Transactions on Information Science and Applications 3(2006), 439-443
  20. GROEK, O., ZAJAC, P.: Efficient selection of the AES-class MixColumns parameters. WSEAS Transactions on Information Science and Applications, Issue 4, Vol. 4 (2007), pp. 663-668.


Vedeck prce v recenzovanch konferennch zbornkoch
  1. GROEK, O.: Remark to RSA Cryptosystem exponent. Zbornk 2. konferencie Electronics 89, (1989), Bratislava, 191-195.
  2. GROEK, J., GROEK, O.: Unicity Distance and The Order of a Language. In: 1st International Conference on Applied Mathematics and Informatics at Universities 2001. Gabkovo, 6.-7.9.2001. - s. 203-206.
  3. GROEK, O.: Applications of Walsh-Hadamard Transform to Finite Semigroups. In: International Conference in Semigroups and Its Related Topics. Kunming, 18.-23.8.1995. - s. 149-156.
  4. GROEK, O.: Ochrana informcie - histria, sasnos a perspektvy. In: Bezpenos informanch systmov. Bratislava, 14.-15.5.1997. - s. 6-15.
  5. GROEK, O., MAGLIVERAS, S.S., WEI, W.: On the Security of a Public-Key Cryptosystem. In: International Conference Organized by the Stefan Banach International Mathematical Centre "Public-Key Cryptography and Computational Number Theory". Warsaw, 11.-15.9.2000. - s. 71-75.
  6. GROEK, O., SATKO, L., NEMOGA, K.: Ideal Difference Tables from an Algebraic Point of View. In: Criptologa y seguridad de la informacin. Tenerife, 14.-16.9.2000. - s. 453-454.
  7. SATKO, L., GROEK, O.: Walsh - Hadamard Traces in Semigroups. In: International Congress ICAC'97 "Algebras and Combinatorics". Hong Kong, 19.-23.8.1997. - s. 373-380.
  8. SATKO, L., GROEK, O., NEMOGA, K.: Kontrukcie S-boxov s vysokou nelinearitou. In: Medzinrodn vedeck konferencia 60.vroie Stavebnej fakulty STU v Bratislave. Bratislava, 18.-20.11.1998. - s. 217-222.
  9. GROEK, O., MAGLIVERAS, S.S., WEI, W.: On the Security of a Public-Key Cryptosystem. In: International Conference Organized by the Stefan Banach International Mathematical Centre "Public-Key Cryptography and Computational Number Theory". Warsaw, 11.-15.9.2000. - s. 71-75.
  10. GROEK, O., SATKO, L., NEMOGA, K.: Ideal Difference Tables from an Algebraic Point of View. In: Criptologa y seguridad de la informacin. Tenerife, 14.-16.9.2000. - s. 453-454.
  11. GROEK, J., GROEK, O.: Unicity Distance and The Order of a Language. In: 1st International Conference on Applied Mathematics and Informatics at Universities 2001. Gabkovo, 6.-7.9.2001. - s. 203-206.
  12. GROEK, O., ZAJAC, P.: Searching for a different AES-class MixColumns operation . Proceedings of 6th WSEAS Int. Conf. on Applied Computer Science (ACS 06), December 1618, 2005, Tenerife. s. 307-310


In evidovan publikcie
  1. GROEK, O.: Poznmka k jednmu rozdeleniu pravdepodnosti, Mat. obzory 8, 1975, 61-64.
  2. GROEK,O.: Abstraktn entrpia na pologrupch, Zbornk PROBASTAT, vydal MT.Bratislava, 1976, 2 strany.
  3. GROEK,O.: Poznmka o entrpii na Booleovch algebrch, Zbornk PROBASTAT, vydal MT., 1977, 1 strana.
  4. GROEK, O.: Falon kocka, Zbornk PROBASTAT, vydal MT., 1978, 1 strana.
  5. GROEK,O.: A-ideals in Semigroups II. Zbornk Szeged conference on Semigroups, Szeged, 1981, 32.
  6. GROEK, O. - HORK,P.: lohy pre prcu v matematickom krku, Mat.obzory 15, 1981, 85-90.
  7. GROEK,O.: et.al.Merania a modely relneho diskrtneho kanla, Zbornk 1. konferencie Elektrotechnics 88, Bratislava 271-276.
  8. GROEK,O.-SATKO,L.-SCHEIN,B.: Eightieth birthday of Professor tefan Schwarz, Semigroup Forum 49 (1994), 1-5.
  9. GROEK,O.-SATKO,L.: Profesor Schwarz-nov doktor technickch vied h.c. Informcie STU v Bratislave 5 (1994), december, strana 2,.
  10. GROEK,O.-SATKO,L.: International Conference in Koovce, May 29-31, 1994, Semigroup Forum 50 (1995), 121-122.
  11. GROEK, O.: Did Schwarz wrote a paper from applied mathematics?. In Proceeding of International Conference A Semigroup Meeting, May 29-31, 1994, Koovce, s.5-6.
  12. GROEK, O.: O stabilite prdovch ifier. In: Jesenn seminr z kryptoanalzy. Lipt. Mikul, 9.-11.10.1996. - s. 14-26.
  13. GROEK, O.: Walsh-Hadamard transform on finite semigroups. In: The International Conference in Semigroups and Related Topics, Kunming, China 18-23 August 1995, s. 18.
  14. GROEK, O.: Walsh-Hadamard Transform and Finite Groups. In: The First Pythagorean Conference. Spetses, Greece, 1.-7.6.1996. - s. 22.
  15. GROEK,O.-SATKO,L.: Walsh Hadamard Traces in semigroups. In: Collections of Abstarcts of ICAC 97, 18-23 August, 1997, 1 page.
  16. GROEK, O.: O vzahu akademika tefana Schwarza k aplikcim matematiky. In: Pokroky matematiky, fyziky a astronmie. - Ro. 43, .4 (1998), s. 314-319.
  17. GROEK, O., ZANECHAL, M.: ifrovanie I. In: Svet komunikcie. - Ro. 1, .4 (1998), s. 10-11.
  18. GROEK, O., ZANECHAL, M.: ifrovanie II. In: Svet komunikcie. - Ro. 2, .1 (1999), s. 24-26.
  19. GROEK,O.-NEMOGA,K.-SATKO,L: A Remark to Luby-Rackoff and Ueli M. Maurer Pseudorandom Generators. In: Abstarcts from the 2nd Czech and Polish conference on Number Theory. Cieszyn, June 16-18,1998, 1 page.
  20. GROEK, O., NEMOGA, K., SATKO, L.: A Remark to Short RSA Public Exponents. In: 2nd Czech and Polish Conference on Number Theory. Cieszyn, 16.-18.6.1998.
  21. GROEK, O., NEMOGA, K., SATKO, L.: Generalized S-Boxes Serving Zero Mutual Information. In: 14th Czech and Slovak International Conference on Number Theory. Liptovsk Jn, 6.-10.9.1999. - s. 12.
  22. GROEK, O., NEMOGA, K., SATKO, L.: A Remark to Luby-Rackoff and Ueli M.Maurer Pseudorandom Generators. In: 14th Czech and Slovak International Conference on Number Theory. Liptovsk Jn, 6.-10.9.1999. - s. 14.
  23. GROEK, O., NEMOGA,K., SATKO,L.: Generalized S-boxes serving zero mutual information, Abstracts of 14th Czech and Slovak International Conference on Number Theory, Liptovsk Jn, September 6-10, 1999, p.12.
  24. GROEK,O., NEMOGA,K., SATKO,L.: A remark to Luby-Rackoff and Ueli M. Maurer pseudorandom generators, Abstracts of 14th Czech and Slovak International Conference on Number Theory, Liptovsk Jn, September 6-10, 1999, p. 14.
  25. SATKO,L., GROEK,O., NEMOGA,K.: New effective design of Boolean functions, Abstracts of 14th Czech and Slovak International Conference on Number Theory, Liptovsk Jn, September 6-10, 1999, p.13.
  26. GROEK,O.-NEMOGA,K.-SATKO,L.: Tablas de diferencias ideales desde un punt de vista Algebrico. CRIPTOLOGA y SEGURIDAD de la INFORMACIN. Editors Pino Cabalero Gil and Candelaria Hernndez Goya, RA-MA, Madrid, 2000, pp.453-454.
  27. ERBEN, P., GROEK, O.: Elektronick podpis, digitlny podpis. In: Bulletin slovenskej advokcie. - .3 (2001), s. 5-12.
  28. GROEK,O. SATKO,L.: Education and Research in Cryptography at the Department of Mathematics FEI STU v Bratislava, Journal of Electrical Engineering, vol 52 (2001) No.7-8, 244-247.
  29. GROEK,O.-IKA, J.: Signature schemes based on matrices. Abstracts of the 33rd Southeastern International Conference on Combinatorics, Graph Theory and Computing., Florida Atlanctic Cuniversity, March 4-8, 2002, p.87.
  30. GROEK, O., MAGLIVERAS, S.: Is Rijndael realy independent on the field polynomial? Proceedings of WARTACRYPT04 The 4th Central European Conference on Cryptology, July 1-3, 2004, Bedlewo, Poland, p. 43
  31. GROEK, O., NOVK. V., SS, M., ZAJAC. P.:Dlhodob archivcia elektronickch dokumentov, Zbornk abstraktov PKI 2004, 11.11. 2004,Bratislava, Holliday Inn, 8 strn
  32. GROEK, O., NOVK. V., SS, M., ZAJAC. P.: Problmy elektronickej archivcie, Mikulska kryptobesdka, 5.-7.12.2004, Praha
  33. GROEK, O., HORK, P., ZAJAC, P.: A bridge between design of block ciphers and Boolean matrices. MORAVIACRYPT05, 15.-17. 06. 2005, Brno.
  34. Nmethov, Z., Groek, O., Babinec, M.: Slovak Fingerprint Individuality model. 9th Annual Cogent User Group International Conference, Security Barders with Fingerprints, Oct. 28 Nov. 1, 2006, Anaheim, California.
  35. Editor Begabtenfrderung im MINT-Bereich (Mathematik, Informatik, Naturwissenschaften, Technik), Band 14, spolus Gudrun Kalmbach H.E.(Hrsg.) Aegis- Verlag, Ulm, 2006.


Vysokokolsk skript, uebnice a monografie
  • uebnice a monografie
    1. KOLEKTV : Djiny matematiky a fyziky v obrazech III. Vyd.JSMF,Praha 1984.
    2. KOLEKTV: Djiny matematiky a fyziky v obrazech IV. Vyd.JSMF, 1985.
    3. GROEK,O.-VOLAUF,P.: Prklady z matematiky na prijmacie pohovory, SNTL-ALFA, Bratislava, 1988.
    4. GROEK,O.-PORUBSK, .: ifrovnie-metdy, algoritmy, prax, Vydavatestvo GRADA, Praha 1992, 257 strn
    5. KOLEKTV: Encyklopdia Beliana, E SAV, 57 hesiel 1996-2003
  • skript
    1. GROEK,O.: Stochastick procesy a teria informci, skriptum, Nvody na cvienia, ES SVT v Bratislave, Bratislava, 1983, (oprav.vyd.1987).
    2. GROEK,O.: vod do terie hromadnej obsluhy, skriptum pre PG, 1983, Videopres MON (2 vydania).
    3. GROEK, O. - VOLAUF, P.: Stochastick procesy a teria informci, skriptum, ES SVT 1990.
    4. GROEK, O. - VOLAUF, P.: lohy z matematiky pre prijmacie pohovory, skriptum, ALFA, 1985.- 3 vydania
    5. GROEK, O.: vod do terie kdovania a kryptolgie, skriptum PG, VT Bratislava 1985 (3 vyd.).
    6. GROEK, O.: Teria kdovania a ochrany informci, skriptum PG, EF SVT, 1987.
    7. GROEK, O.: Systmy hromadnej obsluhy a ich simulcia, skriptum PG, VT Bratislava, 1987.
    8. GROEK, O.: Teria informci, skriptum PG, EF SVT 1989.
    9. GROEK,O.: Markov processes with applications to queuing theory, Uebn texty pre tdium v anglickom jazyku na EF STU, Bratislava, 1993, 117 strn.
    10. STEINLOV, K.-WEIDLICH, M.-VARGA, M.-POLJOVKA, P.-GROEK, O.,- KUKUA, P.-KOV, K.-LELK, J.-WGNER, J.-MUDRONK,D.-TURCEL,J.- KEMPN. M.: Smernice a normy ES pre elektrotechniku, energetiku a riadiace systmy. Vzdelvac program PHARE, skriptum, 1. as str. 5-1 -- 5-16, FEI STU, 1996 (EC Directives and Standards for Electrical and Power Engineering and Control Systems, Part.1).(in Slovak).
    11. GROEK,O. - NEMOGA,K. - SATKO,L.- ZANECHAL,M.: KRYPTOLGIA I, Zklady a aplikcie v bankovnctve, FEI STU, 1998, 160 strn
    12. GROEK,O. - NEMOGA,K. - SATKO,L.- ZANECHAL,M.: KRYPTOLGIA II, Zklady a aplikcie v bankovnctve, FEI STU, 1999, 143 strn
    13. GROEK,O. - SATKO,L. - NEMOGA,K. - MACK,K. - ZANECHAL,M.: KRYPTOLGIA III, Zklady a aplikcie v bankovnctve, FEI STU, Bratislava, 1999, 186 strn.
    14. GROEK,O. - SATKO,L.- NEMOGA,K. - MACK,K. - ZANECHAL,M.: KRYPTOLGIA IV, Zklady a aplikcie v bankovnctve, FEI STU, Bratislava, 1999, 171 strn.
    15. GROEK,O. - SATKO,L.- NEMOGA,K. - MACK,K. - ZANECHAL,M.: KRYPTOLGIA V, Zklady a aplikcie v bankovnctve, FEI STU, Bratislava, 1999, 180 strn.
    16. GROEK,O. - SATKO,L.- NEMOGA,K. - MACK,K. - ZANECHAL,M.: KRYPTOLGIA VI, Zklady a aplikcie v bankovnctve, FEI STU, Bratislava, 2000, 145 strn.
    17. GROEK,O. - NEMOGA,K. - SATKO,L.- ZANECHAL,M-A. MORAVKOV M. DOMNY: KRYPTOLGIA VII, Zklady a aplikcie v bankovnctve, FEI STU, 2000, 155 strn
    18. GROEK, O. - SATKO, L. - NEMOGA, K.- AKANTIS,D.- VOJVODA, M.: Kryptolgia. Zklady a aplikcie v bankovnctve VIII. Bratislava: FEI STU, 2001. 86 s.
    19. GROEK, O. - SATKO, L. - NEMOGA, K. STRND, O., RMKA M.,-VOJVODA, M.: Kryptolgia IX. Zklady a aplikcie v bankovnctve. Bratislava: FEI STU, 2002. 86 s.
    20. GROEK, O. - SATKO, L. - NEMOGA, K.ORAVEC,P., IKA, J.,VVRA,A., VOJVODA, M., ZANECHAL,M.: Kryptolgia X. Zklady a aplikcie v bankovnctve. Bratislava: FEI STU, 2003. 117 s.
    21. GROEK O., HERRERA-GARCIA, S.: Cryptology or What Kama sutra did suggested. Lecture notes for a course given at CITEDI-IPN, Tijuana, Mexico. Published by CITEDI-IPN Research Center, Mesa de Otay, Tijuana B.C., Mexico, (2001), 138 strn
    22. GROEK, O. - SATKO, L. - NEMOGA, K.- VOJVODA, M., IKA, J., ZANECHAL, M., BRABCOV, K., VVRA, A.: Kryptolgia XI. Zklady a aplikcie v bankovnctve, STU FEI Bratislava, 118 s. 23.-24.6.2005
    23. GROEK, - VOJVODA, M., ZAJAC, P., ZANECHAL, M.: Zklady kryptografie. STU FEI Bratislava, 188 s., 2006.


Popularizan prce
  1. GROEK,O.-HORK,P.: Matematika pre kadho, Pionrska tafeta, 11 (1978), 20.
  2. GROEK,O.-HORK,P.: Prechod cez zamoren zemie, Pionrska tafeta 12 (1978), 20-21.
  3. GROEK,O.-HORK,P.: Obdniky, Pionrska tafeta 1 (1979), 20.
  4. GROEK,O.-HORK,P.: Aritromachia, Pionrska tafeta 2 (1979), 20.
  5. GROEK,O.-HORK,P.: Hra v zpalky, Pionrska tafeta 3 (1979), 20.
  6. GROEK,O.-HORK,P.: tvorcov slov, Pionrska tafeta 4 (1979), 20.
  7. GROEK,O.-HORK,P.: Aj hdanie sla me by vedou, Pionrska tafeta 5 (1979), 20.
  8. GROEK,O.-HORK,P.: Pionierska pytagorida, Pionrska tafeta 6 (1979), 20.
  9. GROEK,O.-HORK,P.: Metodick a organizan pokyny na Pioniersku pytagoridu 78/79 vydavatestvo DPM KG, 20 strn.
  10. GROEK,O.-HORK,P.: Metodick a organizan pokyny na Pioniersku pytagoridu 79/80 vydavatestvo DPM KG, 20 strn.
  11. GROEK,O.-HORK,P.: Metodick a organizan pokyny na Pioniersku pytagoridu 80/81 vydavatestvo DPM KG, 20 strn.
  12. GROEK,O.-HORK,P.: Metodick a organizan pokyny na Pioniersku pytagoridu 81/82 vydavatestvo DPM KG, 20 strn.
  13. GROEK,O.-HORK,P.: Metodick a organizan pokyny na Pioniersku pytagoridu 82/83 vydavatestvo DPM KG, 20 strn.
  14. GROEK,O.-HORK,P.: Pionierska pytagorida, Smr, 3 (1978), 38-41.
  15. GROEK,O.: Kuk do matematiky, Zornika 1 (1982), 13.
  16. GROEK,O.: Zaifrovan informcie, Elektrn 9 (1979), 8-15.
  17. GROEK,O.: ifrovanie s matematikou, Elektrn 9 (1980), 34-35.
  18. GROEK,O.: Nao je matematika dobr, Elektrn 10 (1980), 53.
  19. GROEK,O.: Matematika a biolgia, Elektrn 11 (1980), 53.
  20. GROEK,O.: Chcete robi matematiku?, Elektrn 12 (1980), 53.
  21. GROEK,O.: Matematika a kalkulaky, Elektrn 2 (1981), 57.
  22. GROEK,O.: Matematika a fyzika, Elektrn 3 (1981), 57-58.
  23. GROEK,O.: Matematika a medicna, Elektrn 4 (1981), 57.
  24. GROEK,O.: Matematika a plnovanie experimentu, Elektrn 5 (1981), 56-57.
  25. GROEK,O.: tvorcov slov, Elektrn 6 (1981), 56-57.
  26. GROEK,O.: Leto s matematikou I., Elektrn 7 (1981), 56-57.
  27. GROEK,O.: Leto s matematikou II., Elektrn 8 (1981), 56-57.
  28. GROEK,O.: i, Elektrn 3 (1982), 40.
  29. GROEK,O.: Pestr tvary kontnt, Elektrn 4 (1982), 38-39.
  30. GROEK,O.: 4 lohy z fyziky, Elektrn 4 (1982), 53.
  31. GROEK,O.: 4 lohy z astronmie, Elektrn 5 (1982), 53.
  32. GROEK,O.: ABRACADABRA, Zaujmav pouitie potaa, Elektrn 2 (1982), 50.
  33. GROEK,O.: Eugenika, Sov. literatra, Elektrn 7 (1982), 50.
  34. GROEK,O.: Hlavn smery v sasnej matematike, Elektrn 8 (1982), 50.
  35. GROEK,O.: Przdniny s matematikou, Elektrn 12 (1982), 7.
  36. GROEK,O.: Axiomy euklidovskej geometrie, Elektrn 1 (1983), 50.
  37. GROEK,O.: 4-rozmern teles, Elektrn 12 (1982), 31.
  38. GROEK,O.: Aplikcia elektroakupunktry, Elektrn 2 (1983), 51.
  39. GROEK,O.: S kalkulaky na kolch povolen?, Elektrn 3 (1983), 50.
  40. GROEK,O.: Hry pre riadiacich pracovnkov, Elektrn 4 (1983), 51.
  41. GROEK,O.: Chemick ltky v displejoch, Elektrn 6 (1983), 51.
  42. GROEK,O.: Solrnotermlna premena, Elektrn 6 (1983), 51.
  43. GROEK,O.: Teplo zo spaovania odpadov, Elektrn 7 (1983), 50.
  44. GROEK,O.: Koopercia zo ZSSR v oblasti elektronickho priemyslu, Elektrn 10 (1983), 50.
  45. GROEK,O.: Vek prvosla, Elektrn 12 (1983), 51.
  46. GROEK,O.: Nebezpeenstvo prrodnch katastrof, Elektrn 1 (1984), 51.
  47. GROEK,O.: 20 krt odpovedz matematika, Elektrn 1 (1984), 61.
  48. GROEK,O.: Nov observatrium vo Vysokch Tatrch, Elektrn 3 (1984), 50.
  49. GROEK,O.: Je Slovensko bohat na nerastn suroviny?, Elektrn 3 (1984), 51.
  50. GROEK,O.: Prepoet tony mernho paliva , Elektrn 5 (1984), 51.
  51. GROEK,O.: Budcnos kontinentov, Elektrn 6 (1984), 51.
  52. GROEK,O.: Termojadrov reaktor v SSR, Elektrn 8 (1984), 50.
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