1. K.H. Althoff et al., Proc. 11th Int. Ace. Conf., CERN 1980, p.196 D. Husmann, BONN-IR-83-6
2. K.H. Althoff, Proc. of the Workshop “From collective states to quarks in nuclei”, Bologna, (1980)
3. R. Kajikawa, Proc. of the 10th Int. Symp. on Lepton and Photon Int. at High Energies, Bonn 1981
4. W. Meyer, Proc. of the 6th Int. Symp. on High Energy Spin Physics, Marseille 1984, to be published
5. K.H. Althoff et al., Z. Physik 194 (1966)135