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What is referred to is probably a paper mentioned in letters in 1675 from Henry Oldenburg to Gottfried Leibniz and from John Collins to James Gregory. It seems to have been given to Collins privately. Oldenburg, who was a secretary of the Royal Society of London, sent Leibniz a copy. The latter fact is mentioned by Abraham Seidenberg in his 1974 article in The Complete Dictionary of Scientific Biography. The paper, which is lost, apparently dealt with problems related to the "casus irreducibilis" of cubic equations.
The present Wikipedia article very much needs an update. It seems to be based mainly on Seidenberg's brief biography, whose only source appears to be, in turn, a 1931 article by Johannes Hjelmslev. Thus none of the new results of research from 1938 onwards are mentioned. An apparently fairly exhaustive summary of presently available souces to Mohr and his work including a complete bibliography is provided by the Theseus project of the Department of Mathematical Sciences of the University of Copenhagen.
