1. A sensitive directional gamma-ray detector;Cassen;UCLA Report 49,1949
2. A sensitive directional gamma-ray detector;Cassen;Nucleonics,1950
3. The scintillation counter in clinical studies of human thyroid physiology using 131I;Allen;J Clin Endocrinol Metab,1951
4. Instrumentation for 131I use in medical studies;Cassen;Nucleonics,1951