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— 33 стр.
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 9: Planar cores (IEC 51/1294/CD:2019); Text in German and English