1. D. Vandeplassche, E. van Walle, J. Wouters, N. Severijns and L. Vanneste, contribution to this conference and references therein
2. R. Geerts, Ph. D. thesis, University of Leuven (1977)
3. C. Nuytten, Ph. D. thesis, University of Leuven (1982)
4. L. Vanneste, in Nuclear Orientation, eds. H. Postma and N.J. Stone, (North-Holland, Amsterdam, to be published)
5. K.S. Krane, in Nuclear Orientation, eds. H. Postma and N.J. Stone, (North-Holland, Amsterdam, to be published)