1. M. Gell-Mann:Lectures at the Schladming Winter School 1972, CERN preprint TH 1543.
2. D. Flamm:The quark model of elementary particles, Eeport HEP VII/69 Vienna.
3. D. Flamm andW. Majerotto:Phys. Lett.,26 B, 24 (1967).
4. D. Flamm andW. Majerotto:Nuovo Cimento,54 A, 1016 (1968).
5. M. Böhm, H. Joos andM. Krammer: DESY-preprint 72/11,Nucl. Phys., B, in print.