DIN 51559-1
DIN 51559-1 Testing of mineral oils - Determination of the saponification number - Part 1: Saponification numbers above 2, colorindicator titration
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2009
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2009