1. G. N. Flerov and V. P. Perelygin, At. Energ.,26, 520 (1969).
2. O. Otgonsurén, V. P. Perelygin, and G. N. Flerov, Dokl. Akad. Nauk SSSR,189, 1200 (1969).
3. É. Tses'lyak, JINR Report P15-4738, Dubna (1969).
4. P. Price and R. Fleischer, Phys. Lett.,30B, 246 (1970).
5. O. Otgonsurén et al., At. Energ.,32, 344 (1972).