For citations:

Nepomnyashchy A.A. “Became Superfluous in Crimea”: Ups and Downs of Fate of Professor P. A. Dvoichenko (Correspondence with V. I. Vernadsky). Nauchnyi dialog. 2023;12(2):454-473. (In Russ.) https://doi.org/10.24224/2227-1295-2023-12-2-454-473