J.Phys. , 01.1975    Включает:   Erlykin A.D. ,     Ng L.K. ,     Wolfendale A.W. Muon charge ratio and the mass composition of primary cosmic rays , 01.1975   Presnyakov L.P. ,     Urnov A.M. Asymptotic approach to the theory of excitation of multiply charged ions by electron impact , 01.1975 Copyright © БЕН РАН.