Lauffer R B, Greif W L, Stark D D, Vincent A C, Saini S, Wedeen V J, Brady T J
Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston 02114.
Int J Rad Appl Instrum B. 1988;15(1):47-9. doi: 10.1016/0883-2897(88)90160-2.