Bich, Hoang Thi, et al. “Optimization of the Enzyme Assisted Extraction of Essential Oil from the Leaves and Branches of Cinnamomum Cassia Using Box-Wilson Method”. <i>Vietnam Journal of Science and Technology</i>, vol. 55, no. 6, Dec. 2017, pp. 690-7, doi:10.15625/2525-2518/55/6/9525.