ESTIMATION OF SECURITY OF NUTRITION FOR THE CONDUCTORS OF PASSENGER CARS OF THE RAILWAY OF MONGOLIA MACRO AND MICRONUTRIENTS ArticleTarmaeva I.Yu., Savchenkov M.F., Pankov V.A., Sandalkhan E., Kuleshova M.V.Микроэлементы в медицине. Том 20. 2019. С. 38-44