[Petr Stepanovich Kupalov (on his 90th birthday)].
D006613:Higher Nervous Activity; D049672:History, 19th Century; D049673:History, 20th Century; D011603:Psychophysiology / Q000266:history; D014586:USSR
Petr Stepanovich Kupalov (k 90-letiiu so dnia rozhdeniia).