Silin V.P. ,     Tikhonchuk V.T. On parametric absorption in laser plasma. Phys.Lett. A , Vol.78A,N3 , с. P.246-248 , 01.1980   Silin V.P. ,     Tikhonchuk V.T. ,     Zozulya A.A. On the theory of the oppositely fravelling waves absolute instability in an inhomogeneous medium. Physica Scripta , Vol.28 , с. P.510-512 , 01.1983   Silin V.P. ,     Tikhonchuk V.T. ,     Zozulya A.A. Double stimulated scattering- a novel view on the nonlinear parametric processes in plasma. Phys.Lett. A , Vol.99,N5 , с. P.224-226 , 01.1983