1. J. Kimura, A. Yamanaka, S. Kanazawa, et al., Nucl. Techn. 30, 23 (1993).
2. V. F. Gerasimov, V. V. Danichev, and V. N. Dementiev, Dubna Reports 213, 348 (1997).
3. M. M. Hoffman, W.M. Sanders, and M. D. Semon, Bull. Am. Phys. Soc. 21, 655 (1976).
4. A. A. Bergman and O. N. Goncharenko, Kratkie Soobshcheniya po Fizike FIAN 39(2), 11 (2012) [Bulletin of the Lebedev Physics Institute 39, 38 (2012)].