1. F. Muller: CERN/EP 83-67(1983), Lectures given atThe XX Course of the International School of Subnuclear Physics, Erice, Sicily, August 1982 and theThe XVIII Session of the International School of Elementary Particle Physics, Kupari, Yugoslavia, September 1982.
2. M. Terazawa:Proceedings of the XXI International Conference on High Energy Physics, Paris, 1982, p. C3-191.
3. T. K. Gaisser, T. Stanev andF. Haizen:Proceedings of Topical Workshop on the Production of New Particles in Super Energy Collision, Madison, 1979.
4. L. V. Volkova andG. T. Zatsepin:Sov. J. Nucl. Phys.,37, 212 (1983).
5. H. Inazawa andK. Kobayakawa:Prog. Theor. Phys.,69, 1195 (1983).