Mani M., Mariyaselvakumar M., Samikannu A., Panda A. B., Konwar L. J., Mikkola J. -P. Continuous hydrocyclization of aqueous levulinic acid to ?-valerolactone over bi-functional Ru/NbOPO4/SBA-15 catalyst under mild conditions. 2022. Applied Catalysis A: General. 643. 118744. 10.1016/j.apcata.2022.118744