1. M. F. Brodskii, S. A. Popkov, and V. A. Rylov, “Plant for preparation of liquid samples with specified content of dissolved gas,” Pribory, No. 9, 41–43 (2009).
2. ISO 44–1999, Hydraulic Drives. Liquids. Method of Encoding the Degree of Contamination with Solid Particles [in Russian].
3. NAS 1638, Cleanliness Requirements of Parts Used in Hydraulic Systems, Aerospace Industries of America, Washington, D.C. (2011).
4. GOST 17216–2001, Industrial Cleanliness. Classes of Purity of Liquids [in Russian].
5. MEK 296, Specification for Fresh Oil-Based Insulation Oils for Transformers and Switches [in Russian].