1. M. Gell-Mann:Phys. Lett.,8, 214 (1964).
2. G. Zweig: CERN Report 8419/Th. 412 (1964) (unpublished). See alsoA. Peterman:Nucl. Phys.,63, 349 (1965).
3. M. Gell-Mann:The Eightfold Way, California Institute of Technology Synchrotron Laboratory Report, CSTL-20-1961 andPhys. Rev.,125, 1067 (1962);
4. Y. Ne'eman:Nucl. Phys.,26, 222 (1961).
5. A. W. Sunyar, A. Z. Schwarzschild andP. I. Connors:Phys. Rev.,136, B 1157 (1964).