1. H. Okada, H.Y. Ogawa, Y. Takatsuka, Prolonged release microcapsule and its production, U.S. Patent 4,652,441, March 24, 1987.
2. O.L. Johnson, M.M. Ganmukhi, H. Bernstein, H. Auer, M.A. Khan, Composition for sustained release of human growth hormone, U.S. Patent 5,654,010, August 5, 1997.
3. D. Bodmer, J.W. Fong, T. Kissel, H.V. Maulding Jr., O. Nagele, J.E. Pearson, Sustained release formulations of water soluble peptides, U.S. Patent 5,538,739, June 23, 1996.
4. P. Orsolini, R.Y. Mauvernay, R. Deghenghi, Sustained and controlled release of water insoluble of polypeptides, U.S. Patent 5,192,741, March 9, 1993.
5. The multi-reservoir method as a new preparation method of biodegradable microspheres: principle and application to cisplatin-loaded microspheres;Matsumoto;J. Control. Release,1997