[Roman Aleksandrovich Tkachev (on his 75th birthday)].
D049672:History, 19th Century; D049673:History, 20th Century; D009462:Neurology / Q000266:history; D010336:Pathology / Q000266:history; D012425:Russia (Pre-1917); D014586:USSR
Roman Aleksandrovich Tkachev (k 75-letiiu so dinia rozhdeniia)