A. M.  Hengne, Biradar, N. S., and Rode, C. V., ?Surface species of supported ruthenium catalysts in selective hydrogenation of levulinic esters for bio-refinery application?, Catalysis Letters, vol. 142, no. 6, pp. 779-787, 2012.

P. K.  Jori and Jadhav, V. H., ?Efficient synthesis of gamma-valerolactone-a potential fuel from biomass derived levulinic acid using catalytic transfer hydrogenation over Hf@CCSO3H catalyst?, Catalysis Letters, vol. 150, no. 7, pp. 2038-2044, 2020.