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"Relativistic equations of motion in electromagnetic theory"
P. R. Wallace, Am. J. Math. Vol. 63 (1941) p.729

"On the motion of particles in general relativity theory"
A. Einstein and L. Infeld, Can. J. Math. Vol. 1 (1949) p.209

"Obtaining equations of motion for charged particles in the (v/c)3-approximation by the Einstein-Infeld-Hoffmann method"
M.V.Gorbatenko, Theor. Math. Phys. (Springer-Verlag), Vol. 142, (2005), p. 138