Gong, S.Y.; Jiang, X.; Khang, S.J. & Keener, T.C. Production of elemental sulfur and methane from H{sub 2}S and CO{sub 2} derived from a coal desulfurization process. Quarterly technical progress report, January 1--March 31, 1996, report, December 31, 1996; (https://digital.library.unt.edu/ark:/67531/metadc690914/m1/4/: accessed May 24, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .