%0 Journal Article %A Kh. K. Ishkin %T On continuity of the spectrum of a singular quasi-differential operator with respect to a parameter %J Eurasian mathematical journal %D 2011 %P 67-81 %V 2 %N 3 %U http://geodesic.mathdoc.fr/item/EMJ_2011_2_3_a3/ %G en %F EMJ_2011_2_3_a3