1. [1] Lemar, R. L., “Factors Affecting Sonic Degradation of Polymer Solutions,” Rock Island Arsenal, Rock Island, III., Tech. Rept., 6, 1, 1967, 19-23.
2. [2] Van Horne, W. L., “Viscosity Loss Effects of Polymeric Viscosity Modifiers,” Division of Petroleum Chemistry, American Chemical Society, Preprints 1, 4, 1956, 26-31.
3. [3] American Society for Testing Material, Philadelphia, Pa., “Supplementary Preprint to the 1961 Report of Committee D-2 on Petroleum Products and Lubricants,” Appendix VII, 1961, 61-66.
4. [4] Hachiya, K. and Nitta, T., “Relationship between Friction Coefficient, Viscosity and Compressibility of Polyethylene Glycol,” Tribology Online, 3, 2008, 70-75.
5. [5] Hachiya K. and Tanaka T., “Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface”, Tribology Online, 8, 2, 2013, 227-233.