Castro V. I. B., Mano F., Reis R. L., Paiva A., and Duarte A. R. C.,  "Synthesis and Physical and Thermodynamic Properties of Lactic Acid and Malic Acid-Based Natural Deep Eutectic Solvents",  Journal of Chemical and Engineering Data, vol. 63, issue 7, pp. 2548-2556, doi:10.1021/acs.jced.7b01037, 2018.