Lycourghiotis, A., Defosse, C., & Delmon, B. (1982). Cobalt Molybdenum Catalysts Supported On Sodium Modified Gamma-al2o3 - Characterization and Catalytic Activity in the Hydrogenolysis of Thiophene. Societes Chimiques Belges. Bulletin, 91(7), 613-619. https://doi.org/10.1002/bscb.19820910705 (Original work published 1982)