Terms and nomenclature for cores made of magnetically soft ferrites - Part 1: Terms used for physical irregularities and reference of dimensions— 28 стр.
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities -- Part 5: EP-cores and associated parts for use in inductors and transformers (IEC 63093-5:2018) (english version)
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 11: EC-cores for use in power supply applications (IEC 63093-11:2018) (english version)
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 6: ETD-cores for use in power supplies (IEC 63093-6:2018) (english version)