%0 Journal Article %A A. S. Pechentsov %T Boundary value problems for differential equations, which contain a parameter, with multiple roots of the characteristic equation %J Differencialʹnye uravneniâ %D 1984 %P 263-273 %V 20 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1984_20_2_a9/ %G ru %F DE_1984_20_2_a9