1. R. W. Klebesadel, I. B. Strong, and R. A. Olson, Astrophys. J. Lett. 182, L85 (1973).
2. E. P. Mazets, S. V. Golenetskii, and V. N. Il’inskii, JETP Lett. 19, 77 (1973).
3. E. P. Mazets and S. V. Golenetskii, Astrophys. Space Sci. 75, 1 (1981).
4. E. P. Mazets and S. V. Golenetskii, in Soviet Scientific Reviews, sec. E: Astrophysics and Space Physics Reviews, Ed. by R. A. Syunyaev (Harwood Academic Publ., 1981; Fizmatlit, Moscow, 1982), vol. 1, eng. p. 205, rus. p. 216.
5. E. P. Mazets and S. V. Golenetskii, Sov. Sci. Rev., Sect. E 6(3), 283 (1988).