[Nikolaĭ Nikolaevich Sirotinin (on his 80th birthday)].
D049672:History, 19th Century; D049673:History, 20th Century; D010336:Pathology / Q000266:history; D010827:Physiology / Q000266:history; D012425:Russia (Pre-1917); D013026:Space Flight / Q000266:history; D014586:USSR
Nikolaĭ Nikolaevich Sirotinin (k vos'midesiatiletiiu so dnia rozhdeniia)