1. Gorson RD, Lassen M: Physical aspects of dermatologic radiotherapy. In: Goldschmidt H, ed. Physical Modalities in Dermatologic Therapy: Radiotherapy Electrosurgery, Phototherapy, Cryosurgery. New York, NY: Springer-Verlag, 1978.
2. International Commission on Radiation Units and Measurements. ICRU Report No. 17. Radiation Dosi-metry: x rays Generated at Potentials of 5 to 150 kV. Washington, DC: 1970.
3. International Commission on Radiation Units and Measurements. ICRU Report No. 33. Radiation Quantities and Units. Bethesda, Md: 1980.
4. International Commission on Radiation Units and Measurements. ICRU Report No. 19. Radiation Quantities and Units. Washington, DC: 1971.
5. Wyckoff HO (chairman). Statement by the ICRU. Med Phys. 1976; 3: 52.