1. G.G. Joris, J. Vitrone, Hydrogenation of phenol, US Patent No. 2829166.
2. G.G. Joris, Process for the production of cyclohexanone, US Patent No. 2857432.
3. R.J. Duggan, E.J. Murray, L.O. Winstrom, Process for the production of cyclohexanone, US Patent No. 3076810.
4. F. Zumstien, E. Assmann, R. Koenigsberger, Verfahren zur herstellung von cyclohexanon, Germany Patent No. 1124487.
5. A.A. Sagareishvili, I.M. Grdzelidze, N.G. Sikharulidze, L.P. Glua, V.M. Mdivani, V.P. Mosidze, O.A. Jaoshvili and R.V. Jangjava, Process for the production of cyclohexanone, USSR Authorship Certificate No. 168282.