%0 Journal Article
%A A. A. Belolipetskii
%T Differentiability of the isochronous surfaces in a linear time-optimal problem
%J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki
%D 1973
%P 1319-1323
%V 13
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZVMMF_1973_13_5_a20/
%G ru
%F ZVMMF_1973_13_5_a20