[en] Proved are expansion theorems for squares of the solutions of the boundary-value problem y''+(k2-u(x))y = 0, 0<=X< infinity, y(0,k)=0, which lead to some inversion methods in the perturbation theory for scattering data of this problem
Original Title
O razlozheniyakh po kvadratam reshenij radial'nogo uravneniya Shredingera