Presnyakov L.P. ,     Sobelman I.I. ,     Vainshtein L.A. On one model for the calculation of excitation cross sections for atoms. II-8848 Atomic collision processes. The Proc. of the Third International conference on the physics of electronic and atomic collisions university college, London, 22 nd-26 th July, 1963 / Ed. M.R.C. McDowell , с. P.243-252   Presnyakov L.P. ,     Sobelman I.I. ,     Vainshtein L.A. On the excitation of neutral atoms by electron impact. Proc. Phys. Soc. , Vol.89,Pt.3,N565 , с. P.511-513 , 01.1966