1. G. A. Nikitin, Collection: Hydraulic Machines and Transmissions [in Russian] (Kiev, ?Tekhnika? Press, 1963).
2. C. J. Casalleggi, Hydraulics and Pneumatics, No. 12 (1961).
3. J. A. Farris, Lubrication Engineering, No. 15, (1961).
4. P. N. Belyanin and Zh. S. Chernenko, Aviation Filters and Hydraulic Systems Purification Devices [in Russian] (Mashinostroenie, 1964).