A. K. Rabba, L. Si, K. Xue, M. Li, and G. Li, “In Situ Intestinal Perfusion of Irinotecan: Application to P-gp Mediated Drug Interaction and Introduction of an Improved HPLC Assay”, J Pharm Pharm Sci, vol. 14, no. 2, pp. 138–147, Apr. 2011.