Doi, K.; Genant, H.K. & Rossmann, K. Comparison of image quality in optical and radiographic magnification techniques for fine-detail skeletal radiography: effect of object thickness, article, January 1, 1974; (https://digital.library.unt.edu/ark:/67531/metadc1021083/m1/4/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .