%0 Journal Article
%A N. N. Petrov
%T The boundary of the set of controllability of plane holomorphic systems
%J Differencialʹnye uravneniâ
%D 1973
%P 1618-1626
%V 9
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1973_9_9_a7/
%G ru
%F DE_1973_9_9_a7