%0 Journal Article %A D. Mangeron %A E. Croitoru %T A contribution to the general theory of reduced velocities in tangential coordinates %J Doklady Akademii Nauk %D 1963 %P 54-56 %V 148 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_148_1_a12/ %G ru %F DAN_1963_148_1_a12