DIN EN 1557:1997-03 Surface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X, Y, Z tristimulus values in transmission; German version EN 1557:1996
1997DIN EN 1557:1997-03 Surface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X, Y, Z tristimulus values in transmission; German version EN 1557:1996
1997DIN EN 1557:1997 Surface active agents - Colorimetric characterization of optically clear coloured liquids (products) as X, Y, Z tristimulus values in transmission; German version EN 1557:1996