Sensitometry of screen-film systems for medical radiography – Part 3: Method for determination of sensitometric curve shape, speed and average gradient for mammography
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/2000

Sensitometry of screen/film systems for medical radiography – Part 3: Method for determination of sensitometric curve shape, speed and average gradient for mammography
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2013