TY JOUR TI DEVELOPMENT OF ASH-FREE EXTREME PRESSURE ADDITIVES KW lubricants KW properties KW ash-free additives KW testing KW import substitution JO Transport engineering AU Kornilova, O.P. AU Sholom, V.Y. AU Tyulenev, D.G. AU Kramer, O.L. AU Trofimov, A.S. PY 2023 IS 2023 PB Bryansk State Technical University