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Elnaggar, Y. S. R., El-Massik, M. A., & Abdallah, O. Y. (2009). Self-nanoemulsifying drug delivery systems of tamoxifen citrate: Design and optimization. International Journal of Pharmaceutics, 380(1-2), 133–141. doi:10.1016/j.ijpharm.2009.07.015 
10.1016/j.ijpharm.2009.07.015