Presnyakov L.P. , Urnov A.M. Quantum transitions between highly excited atomic levels induced by External time-dependent forces. J.Phys. , Vol.3,N , с. P.1267-1271 , 01.1970 Presnyakov L.P. Broadening of highly excited atomic levels in an atmosphere of alkali-metal atoms. Phys.Rev. , Vol.2A,N5 , с. P.1720-1725 , 01.1970 Presnyakov L.P. , Urnov A.M. Asymptotic approach to the theory of excitation of multiply charged ions by electron impact. J.Phys. , Vol.8 , с. P.1280- , 01.1975