DIN 4003-1
DIN 4003-1 Concept for the design of 3D models based on properties according to DIN 4000 - Part 1: Overview and fundamental principles
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2014
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2014