1. A.B. Smith and W.P. Poenitz, ENDC/NEANDC Nuclear Standard Files, Version 1980, INDC-36/LN (1980)
2. E.D. Pendlebury, AWRE 0-60 /64 (1964)
3. F.C. Barker, Phil. Mag. 2, 780 (1957)
4. G. De Leeuw-Gierts and S. De Leeuw, S.C.K./C.E.N. Mol Report BLG-501 (1975)
5. H.-H. Knitter, C. Budtz-Jørgensen, M. Mailly and R. Vogt, EUR 5726 e (1977)