RT Journal Article SR Electronic T1 Biophysical Foundations of Supervoltage Roentgen Therapy JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 196 OP 202 VO 5 IS 3 A1 Otto Glasser YR 1938 UL http://www.ccjm.org/content/5/3/196.abstract AB