Al-Hemiri, Adil, Firas Abdul Aziz, and Mu’ayed Ibrahim. 2002. “Volumetric Mass Transfer Capacity Coefficient in the RTL Extractor”. Iraqi Journal of Chemical and Petroleum Engineering 3 (3), 25-30. http://ijcpe.uobaghdad.edu.iq/index.php/ijcpe/article/view/635.