00520naa#a2200193#i#450# EN\\bibl\10617 20250121203629.2 1999-9836 20151217b2015####ek#y0engy0150####ca RUS RU About the Operation and Safety of Labor Journal article Moscow All-Russian center of living standards 2015 7 с. Journal article local Matskulyak I. Aliev U. Matskulyak D. zh-szf.ru