%0 Journal Article %A S. P. Shishatskii %T A priori estimates in the problem of extending a wave field from a cylindrical time-like surface %J Doklady Akademii Nauk %D 1973 %P 49-50 %V 213 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1973_213_1_a11/ %G ru %F DAN_1973_213_1_a11