1. Methode universelle pour réduire et saturer d'hydrogéne les compoés organiques;Berthelot;Bull. Soc. Chim. Fr.,1869
2. Berthelot actually got methylcyclopentane and not cyclohexane according to Paul Sabatier, The method of direct hydrogenation by catalysts;Berthelot,1966
3. Transformation of coal into oil by means of hydrogen;Bergius,1926
4. Transformation of coal into oil by means of hydrogen;Bergius,1926
5. The action of hydrogen on coal;Ivon Graham;J. Soc. Chem. Ind.,1929