title: [In memoriam Prof. Petr Pavlovich Perfil'ev (1897-1977)].
mesh_terms: D049672:History, 19th Century; D049673:History, 20th Century; D010274:Parasitology / Q000266:history; D012425:Russia (Pre-1917); D014586:USSR
vernacular_title: Pamiati professora Petra Pavlovicha Perfil'eva (1897-1977).