1. S. S. Schweber, H. A. Bete, and F. de Hoffmann, Mesons and Fields (Peterson Row, Evanston, 1995; Russ. Transl., Inostrannaya Literatura, Moscow, 1957), Vol. 1.
2. V. B. Berestetskii, E. M. Lifshitz, and L. P. Pitaevskii, Relativistic Quantum Theory (Russ. original, Parts 1 and 2, Nauka, Moscow, 1968, 1971; Pergamon Press, Oxford, 1971).
3. G. A. Kotel’nikov, in Proceedings of the Fifth Workshop on Symmetry Methods in Physics, Obninsk, July 1991 (Obninsk, 1992), p. 252; Izv. Vyssh. Uchebn. Zaved., Fiz. 12, 69 (1992).
4. G. A. Kotel’nikov, http://xxx.lanl.gov/abs/quantph/9703047 (9707003).
5. J. Rosen, Am. J. Phys. 41, 586 (1973).