Foley, James C.; Rehbein, David K. & Barnard, Daniel J. Investigation of the Sintering Process Using Non-Contact Electromagnetic Acoustic Transducers, article, May 30, 2001; (https://digital.library.unt.edu/ark:/67531/metadc740296/m1/1/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .