Aratyn, H.; Brekke, L.; Keung, Wai-Yee & Sukhatme, U. Studies in theoretical high energy particle physics, report, January 1, 1992; (https://digital.library.unt.edu/ark:/67531/metadc1103676/m1/1/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .