1. An Experimental Investigation of the Stability of Nuclei against Double Beta-Disintegration
2. A.O. Weissenberg, Nuclear Emulsions, Fizmatgiz, Moscow, 1961 (in Russian).
3. A.S. Barabash, et al., Preprint ITEP no. 13, 1987.
4. A.S. Barabash, et al., Preprint ITEP no. 104-88, 1988.
5. A.S. Barabash, et al., in: Proceedings of the Second International Symposium “Underground Physics’87”, Baksan Valley, August 17–19, 1987, Nauka, Moscow, 1988, p. 305.