Quality control of nuclear medicine instruments – Part 4: Constancy testing of positron emission tomographs (PET)
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2004

Constancy testing of nuclear medicine instruments – Part 4: Positron emission tomographs (PET)
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2016