Dimensions of square cores (RM-cores) made of magnetic oxides and associated parts; Amendment A2; (IEC 60431:1983/A2:1996); German version EN 60431:1997/A2:1998— 7 стр.
Magnetic oxide cores (ETD-cores) intended for use in power supply applications - Dimensions (IEC 61185:1992 + A1:1995); German version EN 61185:1997— 14 стр.