1. For a review seeM. Ademollo: inSpringer Tracts in Modern Physics, Vol.59 (Berlin, 1970).
2. For a review seeG. Venturi:A dual relativistic quark model, to be published in the1972 Proceedings of the «Ettore Majorana School» for Subnuclear Physics.
3. G. Venturi:Nuovo Cimento,12 A, 1065 (1972);17 A, 343 (1973).
4. R. Oehme: inHigh Energy Physics and Elementary Particles (Vienna, 1965);R. Delbourgo et al.: inHigh-Energy Physics and Elementary Particles (Vienna, 1965);B. Sakita andK. C. Wali:Phys. Rev.,139, B 1355 (1965).
5. P. Mazzanti andG. Venturi:Nucl. Phys.,45 B, 143 (1972);G. Venturi:Nuovo Cimento,19 A, 1 (1974).