Nesterova N.M. , Chudakov A.E. Cherenkov radiation of extensive air showers. Nuovo Cimento , Vol.8,suppl.N2 , с. P.606-611 , 01.1958 Dobrotin N.A. , Zacepin G.T. , Chudakov A.E. , Grigorov N.L. , Vernov S.N. Investigation of interaction at extremely high-energies using the analysis of extensive air showers. Nuovo Cimento , Vol.8,suppl.N2 , с. P.737-741 , 01.1958 Nesterova N.M. , Chudakov A.E. , Zatsepin V.I. , Dadykin V.L. A search of photons with the energy of 1O~13 ev from discrete sources of cosmic radiation. en=ru Неизвестное название , Vol.3 , с. P.106-108 , 01.1962 Nesterova N.M. , Chudakov A.E. , Zatsepin V.I. , Dadykin V.L. On high energy photons from local sources. I-8632 Intern. Conf. on Cosmic Rays. Jaipur, december 1963. Proc. , Vol.4 , с. P.199-202 , 01.1963