1. Solvation and Hydrogenation of Coal
2. Storch, H. H., Fisher, C. H., Hawk, C. O. and Eisner, A., Bureau of Mines Technical Paper 654 (1943)
3. Dunstan, D., Proceedings of the Second International Conference on Bituminous Coal, vol. I, p. 226 (1928)
4. U.S.P. 1,208,833
5. B.P. 376,509