1. D. Schildknecht: DESY preprint 74/50;XVII Conference on High-Energy Physics (London, 1974), p. iv-80.
2. La physique du neutrino à haute energie (Ecole Polytechnique, 18–20 Mars 1975), edited byA. Rousset andP. Petian (Editions du Centre Nationale de la Recherche Scientifique, 1975).
3. D. Schildknecht andF. Steiner:Phys. Lett.,56 B, 36 (1975).
4. M. Krammer, D. Schildknecht andF. Steiner: DESY preprint 74/64.
5. M. Krammer: DESY internal note, February 1975 (unpublished).