%0 Journal Article %A È. I. Grudo %A P. G. Lasy %T Determination of the characteristic vectors of functions of several variables and of stability in the first approximation %J Differencialʹnye uravneniâ %D 1988 %P 389-393 %V 24 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_3_a3/ %G ru %F DE_1988_24_3_a3