%0 Journal Article %A È. I. Grudo %T Representation of fundamental matrices of Pfaffian systems with coefficients that have uniform asymptotic expansions %J Differencialʹnye uravneniâ %D 1979 %P 199-214 %V 15 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1979_15_2_a1/ %G ru %F DE_1979_15_2_a1