Sensitometry of screen-film systems for medical radiography – Part 10: Nominal values of speed and average gradient
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1995

Sensitometry of screen-film systems for medical radiography – Part 10: Nominal values of speed and average gradient
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2013