Nikolsky S.I. , Nam R.A. , Yakovlev V.I. , Stamenov J.N. , Pavluchenko V.P. , Chubenko A.P. , Ershova T.A. Effective cross section for inelastic collisions of hadrons with atomic nuclei of air and lead. 13-th Intern. cosmic ray conf. Denver , Vol.3 , с. P.2191-2196 , 01.1973