%0 Journal Article
%A Yu. G. Bulychev
%T A general theory of approximate methods for constructing parametrized solutions of linear differential equations
%J Differencialʹnye uravneniâ
%D 1998
%P 395-402
%V 34
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1998_34_3_a15/
%G ru
%F DE_1998_34_3_a15