1. J. Dias de Deus:Nucl. Phys.,59 B, 231 (1973).
2. Z. Koba, H. B. Nielsen andP. Olesen:Nucl. Phys.,40 B, 317 (1971).
3. A. J. Buras andJ. Dias de Deus:Nucl. Phys.,71 B, 481 (1974).
4. A. N. Diddens:Proceedings of the XVII International Conference on High-Energy Physics (London, 1974). The basic curves for σtot, σin and σil come from this talk.V. Barger:Proceedings of the XVII International Conference on High-Energy Physics (London, 1974). The fit to σin is taken from this talk.
5. V. Barger, J. Luthe andR. J. N. Phillips:Nucl. Phys.,88 B, 237 (1975).