%0 Journal Article %A È. I. Grudo %T Complete integrability of linear Pfaffian systems and conditions for linear independence of analytic functions of several variables %J Differencialʹnye uravneniâ %D 1986 %P 891-894 %V 22 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1986_22_5_a23/ %G ru %F DE_1986_22_5_a23