[The role of the hereditary environment in the origin of slight degrees of oligophrenia (evaluation of research in twins)].
D004200:Diseases in Twins; D006801:Humans; D008607:Intellectual Disability / Q000209:etiology / Q000235:genetics*; D008433:Mathematics
Rol' nasledstvennoĭ sredy v proiszhdenii legkikh stepeneĭ oligofreniĭ (k voprosu ob otsenke bliznetsovykh issledovaniĭ)