[Hygienic recommendations for organizing student extracurricular academic activities].
D000293:Adolescent; D002648:Child; D006801:Humans; D006920:Hygiene; D008606:Mental Processes / Q000502:physiology; D012146:Rest; D012572:School Health Services / Q000458:organization & administration*; D013997:Time Factors; D014586:USSR; D014937:Work
Gigienicheskie rekomendatsii k organizatsii vneauditornykh uchebnykh zaniatiĭ studentov.