title: [Professor Riurik Aleksandrovich Mel'nikov (on his 50th birthday)].
mesh_terms: D049673:History, 20th Century; D009369:Neoplasms / Q000266:history; D014586:USSR
vernacular_title: Professor Riurik Aleksandrovich Mel'nikov (k 50-letiiu so dnia rozhdeniia)