DIN EN IEC 63093-9:2021
铁氧体磁芯. 表面不规则的尺寸和极限指南. 第9部分: 平面磁芯(IEC 63093-9-2020); 德文版本EN IEC 63093-9-2020
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 9: Planar cores (IEC 63093-9:2020); German version EN IEC 63093-9:2020