Zhdanov G.B. ,     Dobrotin N.A. ,     Grigorov N.L. ,     Takibayev Z.. Experimental investigation of nuclear interactions at energies of 10~11 to 10~13 eV (by the data of research in the USSR). II-8632 Intern. conf. on cosmic rays. Jaipur, Dec. 1963. Proc. V.5. High energy interactions. / Ed. R.R.Daniel, P.J.Lavakare, M.G.K.Menon a.o. , Vol.5 , с. P.141-165 , 01.1963