%0 Journal Article %A Sh. G. Bagyrov %T On the existence of a positive solution of second-order parabolic equations with time-periodic coefficients %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1996 %P 86-89 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1996_2_a17/ %G ru %F VMUMM_1996_2_a17