 | Викитека". ru.wikisource.org (in Russian). Retrieved 2024-04-09. Гельмерсен Григорий Петрович // Большая советская энциклопедия: [в 30 т.] / под ред. А. М... 13 KB (1,458 words) - 17:33, 22 April 2024 |
 | Gregor von Helmersen or Grigory Petrovich Helmersen (Russian: Григорий Петрович Гельмерсен, 11 October [O.S. 29 September] 1803 – 15 February [O.S. 3 February] 1885)... 6 KB (478 words) - 15:33, 16 January 2024 |