Chen, W. L.; Poston, J. W. & Warner, G. G. Evaluation of the distribution of absorbed dose in child phantoms exposed to diagnostic medical x rays, report, April 1, 1978; (https://digital.library.unt.edu/ark:/67531/metadc1060365/m1/1/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .