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Gheorghe Mihoc-Caius Iacob Institute of Mathematical Statistics and Applied Mathematics.  

of the Romanian Academy, Bucharest, Romania

Postal Address: Calea 13 Septembrie  No. 13, 050711 Bucharest, Romania

E-mail:  oanav.stamate@yahoo.com ; oana.lupascu@imar.rooana.lupascu_stamate@ismma.ro