1. M. Ericson and T.E.O. Ericson, Ann. Phys. (N.Y.), 36 (1966), 323
2. M. Krell and T.E. O. Ericson, Nucl. Phys. B11 (1969), 521
3. H.A. Bethe, Phys. Rev. Lett. 30 (1973), 105.
4. M. Johnson and H. Bethe, Nucl. Phys. A305 (1978), 418.
5. T.E.O. Ericson, The investigation of nuclear structure by scattering processes at high energy, ed. H. Schopper (North- Holland, Amsterdam, 1975), p. 165.