1. M. Schwartz:Rep. Prog. Phys.,27, 75 (1965).
2. B. Pontecorvo:Proceedings of the XV International Conference on High-Energy Physics (Kiev, 1970), p. 687.
3. See,e.g.,D. Fryberger et al.: quoted inScience News,100, 252 (1971).
4. B. Pontecorvo:Proceedings of the «Neutrino 1975» Conference, Vol.2 (Balatonföred, 1975), p. 124.
5. A. Vovenko et al.:Proceedings of the «Neutrino 77» Conference held at Vaksan Valley, June 1977 Vol.1 (Moscow, 1978), p. 299. See alsoA, Mukhin et al.: Proceedings of the «Neutrino 78» Conference, held at a Purdue University (1978), p. 58.