1. Barashenkov, W.S. and Tonev, W.D. (1972), Wzaimodejstvija wysokoenergeticheskih chastic i atomnyh jader s jadrami, Moscow.
2. Barashenkov, W.S. and Tonev, W.D. (1972), Wzaimodejstvija wysokoenergeticheskih chastic i atomnyh jader s jadrami, Moscow.
3. Barashenkov, W.S. and Tonev, W.D. (1972), Wzaimodejstvija wysokoenergeticheskih chastic i atomnyh jader s jadrami, Moscow.
4. Begelman, M.C. and Sikora, M. (1987), Astrophys. J. 322, 650.
5. Bezler, M., Kendziorra, E., Staubert, R., Hasinger, G., Pietsch, W., Reppin, C., Trumper, J., and Voges, W. (1984), Astron. Astrophys. 136, 351.