A VISCOSITY INDEX IMPROVER FOR LUBRICATING OIL FROM ETHYLENE-PROPYLENE COPOLYMER
Zhao Xingfa, Yang Dezheng, Zhou Yishou, Din Hongan, Zhang Li, Chen Xiuhua, Xu Yun, Liao Shijian, Guo Hefu
Chinese Journal of Applied Chemistry . 1984, (3): 41 -46 .