%0 Journal Article
%A G. N. Yakovlev
%T Differential properties of the extremals of quadratic functionals with discontinuous coefficients
%J Differencialʹnye uravneniâ
%D 1971
%P 1288-1293
%V 7
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1971_7_7_a11/
%G ru
%F DE_1971_7_7_a11