1. P.I. Lee, Synthetic hydrogels for drug delivery: Preparation, characterization and release kinetics. In: D.S.T. Hsieh (Ed.), Controlled Release Systems: Fabrication Technology, Vol. II, CRC Press, Boca Raton, FL, 1988, pp. 61–82.
2. F. Lejoyeux, G. Ponchel and D. Duchêne, Influence of some technological parameters on the bioadhesive characteristics of polyacrylic and matrices, STP Pharma 5 (1989) 893–898.
3. P. Colombo, A. LaManna and U. Conte, System for the Controlled Release of Active Substances, U.S. Patent, No. 4, 839, 177, June 13, 1989.
4. P. Colombo, L. Maggi, A. Gazzaniga, U. Conte, A. LaManna and N.A. Peppas, Drug release from swellable matrices restricted by impermeable coatings, Proc. Int. Symp. Control. Rel. Bioact. Mater. 15 (1988) 40–41.
5. S.R. Lustig and N.A. Peppas, Recent advances in modeling of swelling-controlled release systems, Proc. Int. Symp. Control. Rel. Bioact. Mater. 16 (1989) 167–168.