2018DIN EN IEC 63093-7:2018 Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 7: EER-cores (IEC 63093-7:2018); German version EN IEC 63093-7:2018
2006DIN EN 62317-7:2006 Ferrite cores - Dimensions - Part 7: EER-cores (IEC 62317-7:2005); German version EN 62317-7:2005