Hydro-sulfuration - "Catalysts for residual oil: a study by use of ESR process" by Koza Egi and Keishin Matsumoto, 1970, Box: 19, Folder: 38. Charles Heller papers, RH MS 314. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/492863 Accessed April 29, 2024.