(untitled) - Imperatorskai︠a︡ akademīi︠a︡ naukʺ (Russia). Fiziko-matematicheskoe otdi︠e︡lenīe; Imperatorskai︠a︡ akademīi︠a︡ naukʺ (Russia). Fiziko-matematicheskoe otdi︠e︡lenīe; Imperatorskai︠a︡ akademīi︠a︡ naukʺ (Russia). Fiziko-matematicheskoe otdi︠e︡lenīe
Rossiĭskai︠a︡ akademii︠a︡ nauk.