1. Kernell, R.L., Johnson, C.H.: J. Bull. Am. Phys. Soc. 11 (1966) 630 S29.
2. Hjorth, S.A., Allen, L.H.: Arkiv Fysik 33 (1967) 121.
3. Mistry, V.D., Hollas, C.L., Hiddleston, H.R., Riley, P.J.: Phys. Rev. C 1 (1970) 1595.
4. Emigh, R.A., Anderson, R.E., Samuelson, L.E.: Rep. COO-535-766, p. 64 (1978)
5. quoted in: De Frenne, D., Jacobs, E.: Nucl. Data Sheets 79 (1996) 639.