Mattsson, O., H. Svensson, G. Wickman, S. R. Domen, J. S. Pruitt, and R. Loevinger. 1990. “Absorbed Dose in Water: Comparison of Several Methods Using a Liquid Ionization Chamber”. Acta Oncologica 29 (2):235-40. https://doi.org/10.3109/02841869009126550.