2016DIN EN 60424-1:2016 Ferrite cores - Guidelines on the limits of surface irregularities - Part 1: General specification (IEC 60424-1:2015); German version EN 60424-1:2016
2000DIN EN 60424-1:2000 Ferrite cores - Guide on the limits of surface irregularities - Part 1: General specification (IEC 60424-1:1999); German version EN 60424-1:1999