1. S. K. Bose:Nuovo Cimento,17, 767 (1960), in which the Chew-Low method is applied
2. S. D. Drell andF. Zachariasen :Electromagnetic Structure of the Nucleon (London 1961); the study of the two reactions, e +3H → e′ +N + D, e +3He → e′+p + D is proposed as a modification of the Chew-Low extrapolation
3. N. K. Glendenning andG. Kramer (Lawrence Radiation Laboratory preprint) proposes a different approach to the problem. It should be noted that method (a) seems at present to give rise to certain difficulties in practical application (J. D. Bjorken: private communication), while method (b) cannot be applied at present, due to lack of experimental information, and method (c) requires a definition of the form factors in the region away from the mass shell.
4. H. W. Kendall, J. I. Friedman, E. F. Erickson andP. A. M. Gram:Phys. Rev.,124, 1596 (1961).
5. L. Durand:Phys. Rev.,123, 1393 (1961).