%0 Journal Article
%A Agrachev, A.
%A Bonnard, B.
%A Chyba, M.
%A Kupka, I.
%T Sub-riemannian sphere in Martinet flat case
%J ESAIM: Control, Optimisation and Calculus of Variations
%D 1997
%P 377-448
%V 2
%I EDP-Sciences
%U http://www.numdam.org/item/COCV_1997__2__377_0/
%G en
%F COCV_1997__2__377_0