1. 1) K. Kaneko, A. Koyama and N. Arimoto, Development of Fuel-Efficient Marine Engine Oils That Help Reduce CO2 Emissions, Proc. of the 29th CIAMC World Congress, Paper No.030 (2019) 1-13.
2. 2) C. Amblard, The Challenge of CO2 Emissions Reduction; The Contribution of a New Lubricant Designed for Improved Fuel Efficiency in Four-Stroke Medium Speed Marine Engines, Proc. of the 29th CIAMC World Congress, Paper No.226 (2019) 1-14.
3. 3) F. Girshick, Engine Oils for Improved Fuel Economy and Oil Consumption in Railroad Service, Proc. of the 29th CIAMC World Congress, Paper No.238 (2019) 1-8.
4. 4) J. Hughes, Development of a New Lubricating Oil for Use in Modern High Efficiency Gas Engines, Proc. of the 29th CIAMC World Congress, Paper No.434 (2019) 1-14.
5. 5) K. Yamamori, Current status and issues of the low viscosity gasoline engine oil, Preprint of Tribology Conference of Japanese Society of Tribologists, F1 (2018 Autumn) 1-2.