by Anzon, E.V., Chasnikov, I.Ya, Shakhova, C.I., Streltsov, I.S., Takibaev, Zh.S., Vinnitsky, A.H., Voynov, V.G., Bozoki, G., Fenyves, E., Gombosi, E., Nagy, E., Babecki, J., Czachowska, Z., Furmańska, B., Gierula, J., Hołński, R., Jurak, A., Nowak, G., Rybicki, K., Wolter, W., Dalkhazhav, N., Khoshmukhamedov, R., Shabratova, E.S., Tolstov, K.D., Chernyavsky, M.M., Maslennikova, N.B., Tretyakova, M.I., Zhdanov, G.B., Alekseeva, K.I., Chernev, Kh.M., Todorov, P.T., Azimov, S.A., Gulyamov, U.G., Rechnitsky, T.V., Till, E.A., Bataar, C., Chadraa, B., Sharkhuu, D., Tuvdendorzh, D.
Published in Physics letters. B (01.01.1970)