1. W. Pauli:Nuovo Cimento,6, 204 (1957).
2. For the latest proposal in this direction seeE. T. Lee andC. N. Yang:Implication of the intermediate boson basis of weak interactions, Institute for Advanced Studies, preprint; see alsoT. D. Lee andC. N. Yang:Possible high energy neutrinos experiments, preprint and talk delivered at the New York Meeting of the A.P.S., January, 1960.
3. S. S. Kahana andD. L. Pursey:Nuovo Cimento,6, 1469 (1957).
4. T. D. Lee andC. N. Yang:Phys. Rev.,105, 1671 (1957).
5. L. Landau:Nucl. Phys.,3, 127 (1957).