%0 Journal Article
%A Donchev, Tzanko
%A Krastanov, Mikhail
%A Ribarska, Nadezhda
%A Tsachev, Tsvetomir
%A Zlateva, Nadia
%T Asen L. Dontchev (on the occasion of his 65th birthday) and Vladimir M. Veliov (on the occasion of his 60th birthday)
%J Serdica Mathematical Journal
%D 2013
%V 39
%N 3-4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SMJ2_2013_39_3-4_a0/
%G en
%F SMJ2_2013_39_3-4_a0