Tanaka, Y.; Baba, T.; Tagawa, K.; Waki, R.; Nagata, S. Prediction of Oral Absorption of Low-Solubility Drugs by Using Rat Simulated Gastrointestinal Fluids: The Importance of Regional Differences in Membrane Permeability and Solubility. J Pharm Pharm Sci 2014, 17, 106-120.