Now, that's nice: C. Truesdell. Solutio generalis et accurata problematum quamplurimorum de motu corporum elasticorum incomprimibilium in deformationibus valde magnis, ARMA, 11:1 (1962), 106-113. https://link.springer.com/article/10.1007/BF00253932?LI=true John Ball and R. D. James name it ‘perhaps the only serious scientific paper published in Latin in the 20th century’. Incidentally, Truesdell was the founder of ARMA (it's a decent journal). I don't know if they still accept papers in Latin. That's romantic, but it seems that historically, mathematical community has been more inclined to use the language ensuring the broader audience.