1. L. B. Pikel’ner, Yu. P. Popov, and E. I. Shcharapov, Neutron. To the Fiftieth Anniversary of the Opening (Nauka, Moscow, 1983).
2. L. E. Lazareva, E. L. Feinberg, and F. L. Shapiro, Zh. Eksp. Teor. Fiz. 29, 381 (1955).
3. Yu. P. Popov, Fiz. Elem. Chastits At. Yadra 26, 1503 (1995).
4. Yu. P. Popov, Fiz. Elem. Chastits At. Yadra 34, 448 (2003).
5. A. V. Ignatyuk, M. N. Nikolaev, and B. I. Fursov, At. Energ. 116 (4), 209 (2014).