Smorodin Y.A. , Birger N.G. On interactions of "pi"-mesons and nucleons at high energies. I-7256 Intern. conf. on cosmic rays and the earth strom. III. Cosmic rays. Kyoto, 4-15 Sept., 1961 , Vol.3 , с. P.499-501; disc.: p.501 , 01.1962 Smorodin Y.A. , Birger N.G. Kinematic analysis of high energy interactions. Nucl.Phys. , Vol.30 , с. P.850-854 , 01.1963