1. Betts, R.R., Di Cenzo, S.B., Petersen, J.F.: Phys. Rev. Lett.43, 253 (1979)
2. Betts, R.R., Di Cenzo, S.B., Petersen, J.F.: Phys. Lett.47, 23 (1981)
3. Betts, R.R., Clerc, H.-G., Back, B.B., Ahmad, I., Wolf, K.L., Gagola, B.G.: Phys. Rev. Lett.46, 313 (1981)
4. Betts, R.R.: International Symposium on Resonances in Heavy Ion Reactions, Bad Honnef 1981. In: Lecture Notes in Physics. Eberhard, K.A. (ed.). Vol. 156, p. 185. Berlin, Heidelberg, New York: Springer 1982
5. Zurmuehle, R.W., Kutt, P., Betts, R.R., Saini, S., Hass, F., Hansen, O.: Phys. Lett.129B, 384 (1983)