1. Mittig, W., Cassagnou, Y., Cindro, N., Papineau, L., Seth, K.K.: Nucl. Phys. A231, 316 (1974)
2. Mittig, W.: Thesis, Université de Paris-Sud, 1971 (inpublished)
3. Goldfarb, L.J.B., Seyler, R.G.: Phys. Lett28B, 15 (1968)
4. Albrecht, R.: Thesis, Ruprecht-Karl-Universität Heidelberg, 1974 (unpublished)
5. Lane, A.M. in: Isospin in Nuclear Physics. Wilkinson, D.H. (ed.), p. 509 Amsterdam: North Holland 1969