Bhabha, H. J. ; HarishChandra, (1944) On the theory of pointparticles Proceedings of the Royal Society of London Series A: Mathematical, Physical & Engineering Sciences, 183 (993). pp. 134141. ISSN 09628444

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Official URL: http://rspa.royalsocietypublishing.org/content/183...
Related URL: http://dx.doi.org/10.1098/rspa.1944.0026
Abstract
It is deduced from the conservation of the energymomentum tensor that if the flow of energy and momentum into a tube surrounding a timelike worldline, on which the field is singular, become singular as the size of the tube is contracted to zero, then the singular terms are necessarily perfect differentials of quantities on the worldline with respect to the proper time along the worldline. The same can be proved of any other tensor, as, for example, the angularmomentum tensor, which is conserved. It is proved from this that for any pointparticle whatever having charge, spin or other properties, which need not be specified, it is always possible to deduce exact equations of motion which are finite. It is proved further that if the energymomentum tensor is altered by the addition of partial K^{μ ν σ}/partial x^{σ}, where K^{μ ν σ} is any tensor antisymmetric in ν and σ , then the equations of motion are unaltered, but it is possible to choose K^{μ ν σ} in such a way as to make the flow of energy and momentum into a given tube nonsingular.
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