1. B. Diu:Nuovo Cimento,28, 83 (1963);Qu’est-ce qu’une particule élémentaire (Paris, 1965); see in this connection:B. Jouvet andJ. P. Adam:Nuovo Cimento,29, 1275 (1963); and ref. (2).B. Jouvet:Lecture Notes in theProceedings of the Ninth Latin American School of Physics New York, 1968).
2. B. Jouvet:Lecture Notes in theProceedings of the Ninth Latin American School of Physics New York, 1968).
3. F. E. Low:Nuovo Cimento,25, 678 (1962).
4. H. J. Schnitzer:Nuovo Cimento,39, 727 (1965).
5. P. P. Divakaran:Phys. Rev.,160, 1468 (1967).