the 4/3 claim for electro-magnetic mass
Wikipedia points to the original text of a 1905 article by Poincaré. How's your French?
Thanks. It's decent, actually, but there's still some barrier. Increasing that barrier is changes to physics notation since then (no vectors!).
Fortunately my university library appears to have a copy of an older edition of Rohrlich's Classical Charged Particles, which may help piece things together.
We've had these for a year, I'm sure we all know what to do by now.
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