Also by Stephen (and previously discussed on HN): https://www.cl.cam.ac.uk/~sd601/papers/mov.pdf

As usual, he injects just the right amount of humour. Eg. this footnote in his thesis:

"*This paper is out of print, in Russian, and quite difficult to get a hold of, so the interested reader is directed to a shorter proof by Conway [Con71, p. 105], which is merely out of print."