3Yoshida R,Sakai K,Okano T. Pulsatile drug delivery system using hydrogels[J].Advanced Drug Delivery Reviews,1993,(1/2):85.doi:10.1016/0169-409X(93)90028-3.
4Siegel RA,Pice CG. A strategy for oscillatory drug release general scheme and simplified theory[J].J Control Re1,1995,(01):173.doi:10.1016/0168-3659(94)00082-6.
5Giarnos SA,Dinh SM,Berner B. Temporally controlled drug delivery systems:coupling of pH oscillators with membrane drffusion[J].J Pharm Sv,1995,(05):539.doi:10.1002/jps.2600840505.
6Otsuka M,Matsud Y. Controlled drug release of highly watersoluble pentoxifylline from time-limit disintergration-type wax matrix[J].Pharmaceutical Research,1994,(03):351.doi:10.1023/A:1018944516678.
7Matsuo M,Arimori K,Nakamura C. Delayed-release tablets using hydroxyethylcellulose as a gel-forming matrix[J].International Journal of Pharmaceutics,1996,(02):225.doi:10.1016/0378-5173(96)80001-P.
