Asking for an English version of Aleksandrov's famous 1939 paper in Convex Geometry I have difficulty even in finding a Russian version of the next paper:
"Aleksandrov, A. D., Almost everywhere existence of the second differential of a convex
function and some properties of convex surfaces connected with it (in Russian).
Uchenye Zapiski Leningrad. Gos. Univ., Math. Ser. 6 (1939), 3–35"
This is a quite famous paper which also appears in other questions in MathOverflow, e.g., Aleksandrov's proof of the second order differentiability of convex functions. Since Leningard has changed its name to St. Petersburg, I am not sure what's the current name of this journal.
Thank you very much!
 A: This paper is contained in the 1-st volume of Aleksandrov's Selected works. This has an English translation:
Alexandrov, A. D.
Reshetnyak, Yu. G. (ed.)
Selected works. Part 1: Selected scientific papers. Ed. by Yu. G. Reshetnyak and S. S. Kutateladze, transl. from the Russian by P. S. V. Naidu. (English) Zbl 0960.01035
Amsterdam: Gordon and Breach Publishers. x, 322 p.
I have not seen the translation but in the Russian
original, the paper is on pages 171-207.
Remark. Unfortunately, the English translation does not contain this paper. The table of contents of the English translation is available here:
https://www.amazon.com/Alexandrov-Selected-Works-Part-Mathematics-ebook/dp/B07BFS986K
It only has 322 pages, while the Russian original contains 803 pages.
The Russian original is available for a free download in Genesis library. When searching, be aware that his name has two different spellings in English: Alexandrov and Aleksandrov. The Russian spelling is Александр Данилович Александров.
