Esser, P.D.; Bradley-Moore, P.R.; Atkins, H.L.; Robertson, J.S. & Ansari, A.N. Small computer assisted analysis of camera renograms, article, January 1, 1972; (https://digital.library.unt.edu/ark:/67531/metadc1027737/m1/1/: accessed February 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .