%0 Journal Article %T Kordan Nauryzkhanovich Ospanov (to the 60th birthday) %J Eurasian mathematical journal %D 2015 %P 6 %V 6 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/EMJ_2015_6_4_a0/ %G en %F EMJ_2015_6_4_a0