1. 1) Sasaki, A., Sasaoka, M., Tobisu, T., Uchiyama, S., Sasaki, T.: The Use of Electrostatic Liquid Cleaning for Contamination Control of Hydraulic Oil, Lubrication Engineering, 44-3, 251/256 (1988)
2. 2) Kitahara, A., Watanabe, A.: Electrical Phenomena at Interfaces. Fundamentals, Measurements, and Applications, Marcel Dekker, Inc. (1984)
3. 3) Kishi, K., Yanada, H., et al.: Development of a High-Performance Electrostatic Oil Filter, Proc. 82nd Annual Meeting of Kansai Branch, Japan Soc. Mech. Engrs., 074-1, 11 (room12), (2007) (in Japanese)
4. 4) Yanada, H., Takikawa, Y.: Experimental Approach to Electrostatic Liquid Filtration using a Single Fibre Model, Part 2: Effects of Mechanical Factors, Proc. Instn. Mech. Engrs, Part C: J. Mech. Eng. Sci., 208-C6, 387/393 (1994)
5. 5) Japanese Industrial Standard, Test Powders and Test Particles, JIS Z8901, (1995)