title: [Oleg Konstantinovich Khmel'nitskiĭ (on his 50th birthday)].
mesh_terms: D049673:History, 20th Century; D010336:Pathology / Q000266:history; D012426:Russia
vernacular_title: Oleg Konstantinovich Khmel'nitskiĭ (k 50-letiiu so dnia rozhdeniia)