Sci-Hub | Qualification test methods and new specifications of the U.S.A. for engine oils with additives. Chemistry and Technology of Fuels and Oils, 9(5), 376–379

Vipper, A. B., Lashkhi, V. L., & Bauman, V. N. (1973). Qualification test methods and new specifications of the U.S.A. for engine oils with additives. Chemistry and Technology of Fuels and Oils, 9(5), 376–379. doi:10.1007/bf00729149

10.1007/bf00729149