%0 Journal Article %A V. P. Serebryakov %T On conditions of non-quasiregularity of second-order singular differential operators in a space of vector functions %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2000 %P 13-16 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2000_1_a2/ %G ru %F VMUMM_2000_1_a2