DIN 58141-4
DIN 58141-4 Measurement of fiber optic elements - Part 4: Determination of diameters and thicknesses of optical fibers; Text in German and English
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2014
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2014