title: [Problem of the biological norm in experimental research in hygiene].
mesh_terms: D001695:Biology / Q000592:standards*; D006920:Hygiene; D008433:Mathematics; D010684:Philosophy; D010827:Physiology; D012107:Research Design / Q000592:standards*; D014586:USSR
vernacular_title: Problema biologicheskoĭ normy v éksperimental'nykh issledovaniiakh po gigiene