title: [Professor Evgeniĭ Ignat'evich Kovalevskiĭ (on his 50th birthday)].
mesh_terms: D049673:History, 20th Century; D009885:Ophthalmology / Q000266:history; D014586:USSR
vernacular_title: Professor Evgeniĭ Ignat'evich Kovalevskiĭ (k 50-letiiu so dnia orzhdeniia.