15-th Intern. Cosmic Ray Conf. Bulgaria.1977 , 01.1977    Включает:   Nikishov A.I. Energy spectrum of a lepton pair (contribution from virtual bremsstrahlung) , 01.1977   Vavilov Y.N. ,     Beschapov S.P. ,     Bazarov E.V. ,     Vildanova L.I. ,     Beisembaev R.U. The search for directly produced muon pairs in extensive air shower , 01.1977 Copyright © БЕН РАН.