Orndoff, J. D. & Evans, A. E. STF simulation with PARKA and application to diagnostic instrumentation evaluation, article, January 1, 1976; (https://digital.library.unt.edu/ark:/67531/metadc1445485/m1/1/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .