VаrvarinА., S. Levytska, MylinА., and V. Brei. “Vapour-Phase Conversion of Methyl Lactate into Lactide over TiO2/SiO2 Catalyst at the Lowered Pressure”. Catalysis and Petrochemistry, no. 30, Nov. 2020, pp. 38-42, doi:10.15407/kataliz2020.30.038.