1. Havas, P. (1948). Phys. Rev., 74, 456; Zhdanov, V. I. (1974). Int. J. Theor. Phys.
11, 249; Zhdanov, V. I. (1991). Phys. Lett. A
160, 401; and references therein.
2. Bel, L., Damour, Th., Deruelle, N., Ibañéz, J., and Martin, J. (1981). Gen. Rel. Grav.
13, 963.
3. Kerner, E. H., ed. (1972). The Theory of Action-at-a-Distance in Relativistic Particle Mechanics (Gordon and Breach, New York) [collection of reprints].
4. Llosa, J., ed. (1982). Relativistic Action at a Distance: Classical and Quantum Aspects (Lecture Notes in Physics 162, Springer-Verlag, Berlin-Heidelberg-New York).
5. Longhi, G., and Lusanna, L., eds. (1987). Constraint's Theory and Relativistic Dynamics (Proc. of the Workshop, Arcetri, Florence) (World Scientific, Singapore).