TY JOUR TI Methods of cleaning waste oils KW waste synthetic motor oil KW oil purification KW coagulation KW centrifugation JO Actual directions of scientific researches of the XXI century: theory and practice AU Tupotilov, N.. AU Ostrikov, V.. AU Kornev, A.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov