[Petr Pavlovich Perfil'ev (on his 80th birthday)].
D049672:History, 19th Century; D049673:History, 20th Century; D009326:Naval Medicine / Q000266:history; D010274:Parasitology / Q000266:history; D012426:Russia
Petr Pavlovich Perfil'ev (k 80-letiiu so dnia rozhdeniia).