5[25]I wakura, Taiichiro. Cataplasmscontaining D polyglutamicaaid. J P:20000014691,2000
6[26]Hara, Toshio. Biodegradable water absorbing poly (glutamicacid)resins and method for their manufactuere. J P: 10251402,1998
7[27]Hara, Toshio. Biodegradable water absorbing resins comprising cross linked poly (glutamicacid) and method for their manufactuere. J P:11343339,1999
8[28]Irisato, Yoshihiro, et al. Hingly water absorbing biodegradable resins and its manufacture. J P: 11060729,1999
9[29]Irisato, Yoshihiro, et al. Biodegradable water abs orbing cross linked aminoacid polymers and manufactrue. J P:11240949,1999
10[5]Flory P J. Principles Polym. Chem. Ithaca, NY: Cornell Uiversity Press,1980.598