1. T. W. LEE and J. R. ROBINSON, in Remington: The science and practice of pharmacy. GENNARO, ed., Lippincott Williams and Wilkins: Baltimore, 2nd edition (2000) 903–929.
2. Y. W. CHAIN. In Novel drug delivery systems. Marcel Decker, Inc. New York, 2nd edition (1992) 6–15.
3. L. BRANNON-PEPPAS, Med. Plast. And Biomaterial. 6 (1999) 34–46.
4. S. SAKUMA, M. HAYASHI and M. AKASHI, Adv. Drug Deliv. Rev. 47 (2001) 21.
5. J. KREUTER, in “Nanoparticles” in Colloidal Drug Delivery Systems, J. KREUTER (ed.), Marcel Dekker Inc., New York, (1994), pp. 219–342.