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2. GOST (State Standard) no. 8865-93(MEK 85-84): The Systems of Electric Insulation. Estimation of Heat Resistance and Classification, 2003.
3. Dvigateli sinkhronnye trekhfaznye STD. Tekhnicheskoe opisanie i instruktsiya po ekspluatatsii OVZh.412.041 TO Lys’va (Synchronous Three-Phase Electric Motors (STPEM). Technical Description and User’s Manual. OVZh.412.041 TO. Lys’va).
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