Takriff, M. S., and Z. Masyitah. “Application of Draft Tube in the Reduction of Backmixing Rate in Oscillatory Flow in a Baffled Column”. ASEAN Journal of Chemical Engineering, Vol. 2, no. 1, Dec. 2002, pp. 15-20, https://dev.journal.ugm.ac.id/v3/AJChE/article/view/7513.