Terms and nomenclature for cores made of magnetically soft ferrites - Part 2: Reference of dimensions (IEC 60401-2:2009); German version EN 60401-2:2010— 10 стр.
Ferrite cores - Guidelines on the limits of surface irregularities - Part 3: ETD-cores, EER-cores, EC-cores and E-cores (IEC 60424-3:2015); German version EN 60424-3:2016— 15 стр.