%0 Journal Article %A Osmolovskii, N.P. %A Veliov, V.M. %T Metric sub-regularity in optimal control of affine problems with free end state %J ESAIM: Control, Optimisation and Calculus of Variations %D 2020 %V 26 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/cocv/2019046/ %R 10.1051/cocv/2019046 %G en %F COCV_2020__26_1_A47_0