Marius RĂDULESCU1, Constanţa Zoie RĂDULESCU2 1 Institute of Mathematical Statistics and Applied Mathematics, Casa Academiei Române, 13, Calea 13 Septembrie, Bucharest 5, RO-050711, Romania mradulescu.csmro@yahoo.com 2 I C I Bucharest (National Institute for R & D in Informatics) 8-10 Averescu Blvd. 011455 Bucharest 1, Romania radulescucz@yahoo.com Abstract: The paper presents …

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