%0 Journal Article
%A È. M. Solnechnyi
%T On the causality of operators that arise in problems of mathematical physics with weak nonlinearities
%J Differencialʹnye uravneniâ
%D 1999
%P 801-808
%V 35
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1999_35_6_a11/
%G ru
%F DE_1999_35_6_a11