[Some debatable questions about the classification of jobs according to the degree of difficulty and hazardousness (discussion of an article by E. N. Marchenko, I. S. Kandror and L. S. Rozanov)].
D008452:Maximum Allowable Concentration; D009787:Occupational Medicine / Q000145:classification*; D014586:USSR; D014937:Work
O nekotorykh spornykh voprosakh klassifikatsii rabot po stepeni tiazhesti i vrednosti (k obsuzhdeniiu stat'i E. N. Marchenko, I. S. Kandrora i L. S. Rozanova.