1. Aharonian, F.A. and Sunyaev, R.A.: 1984,MNRAS 210, 257
2. Anders, E., Ebihara, M.: 1982,Geochim. Cosmochim. Acta 46, 2363
3. Audouze, J. and Reeves, H. 1982, in:Essays in Nuclear Astrophysics eds. C.A. Barnes, D.D. Clayton, D.N. Schramm, Cambridge, p.355.
4. Berezinskii, V.S., Bulanov, S.V., Dogiel, V.A., Ginzburg, V.L., Ptuskin, V.S., 1990,Astrophysics of Cosmic Rays, North Holland.
5. Biermann, P.L.: 1995,Space Sci. Rev. (this volume).