1. C. J. Boner, Production and Application of Consistent Lubricants [Russian translation], Gostoptekhizdat pp. 87?93 (1958).
2. S. F. Calhoun, ASLE Trans,3, No. 2, 208 (1960).
3. B. W. Hotten, Advances Petr. Chem. and Refining,9, 98 (1964).
4. V. V. Sinitsyn and A. A. Konstantinov, Zavod. Lab., No. 7 (1967).
5. Book of ASTM Standards, Part 17 (1967).