title: [Further comment on the precepts of Porfiriĭ Ivanov].
authors.forename: V G
authors.initials: VG
authors.lastname: Matveev
mesh_terms: D002648:Child; D002668:Child Rearing; D049673:History, 20th Century; D006801:Humans; D010806:Physical Education and Training / Q000266:history / Q000379:methods; D014586:USSR
vernacular_title: Eshche raz o zapovedvediakh Porfiriia Ivanova.