1. Arnold, R.G., Carlson, C.E., Gross, F.: Phys. Rev. C23, 363 (1981)
2. Haftel, M.I., Mathelitsch, L., Zingl, H.F.K.: Phys. Rev. C22, 1285 (1980)
3. Gross, F.: Nucl. Phys. A358, 215c (1981)
4. Song, H.S., Ridener, F.L. Jr., Good, R.H.: Phys. Rev. D25, 61 (1982)
5. Gourdin, M., Piketty, C.A.: Nuovo Cimento32, 1137 (1964)