%0 Journal Article %A Rusev, P. %T Selected Papers, I, II by Nikola Obrechkoff %J Serdica Mathematical Journal %D 2006 %P 379-382 %V 32 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SMJ2_2006_32_4_a6/ %G en %F SMJ2_2006_32_4_a6