Transformers and inductors for use in electronic and telecommunication equipment - Part 1: Generic specification (IEC 61248-1:1996); German version EN 61248-1:1997— 26 стр.
Adjustable speed electrical power drive systems. General requirements. Rating specifications for a.c. power drive systems above 1000 V a.c. and not exceeding 35 kV— 118 стр.