Soil, investigation and testing – Determination of density of solid particles – Capillary pyknometer, wide mouth pycnometer
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/1997

Soil, investigation and testing – Determination of density of solid particles – Capillary pyknometer, wide mouth pycnometer, gas pycnometer
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2011