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2. G. Wolf, Intern. School of Elementary Particle Physics, Basko Polje, Makarska (1972), and DESY-72/61.
3. R. Diebold, Proc. Boulder Conf. on High Energy Physics (1969).
4. R. Talman, Production of pseudoscalar and vector mesons, Proc. of the 6th Int. Conf. on Electron and Photon Interactions at High Energies, Bonn 1973.
5. H. Harari, Proc. of the Intern. Symp. on Electron and Photon Interactions at High Energies, Daresbury 1969.