Huan, Du, He Yanfei, Tan Zhongqin, and Xiaoxiang Han. 2013. “Catalytic Synthesis of Butyl Isovalerate by BrøNsted Acidic Ionic Liquid under Microwave Irradiation”. Asian Journal of Chemistry 25 (14):7675-78. https://doi.org/10.14233/ajchem.2013.14565.