1. Catalysis in liquid-phase coal hydrogenation;Sol,1951
2. Hydrogenation of asphaltene from coal using halide catalysts;Walter;Amer. Chem. Soc., Div. Fuel Chem.,1970
3. Evaluation of catalysts for hydrodesulfurization and liquefaction of coal;Walter;Amer. Chem. Soc., Div. Fuel Chem.,1974
4. Stannous chloride and cobalt molybdate-alumina catalysts in hydrogenolysis of solvent refined coal;Lovetro David;Ind. Eng. Chem., Prod. Res. Dev.,1977
5. The hydrogenation of Alberta bitumen over cobalt molybdate catalyst;O'Grady,1967