CHITOSAN PREPARATIONWITH MULTISTAGE DEACETYLATION OF CHITINAND INVESTIGATIONOF ITS PHYSICOCHEMICALPROPERTIES Preparasi Kitosan Me/alui Deasetllasi Kitin Secara Bertahap dan Sifat Fisikokimianya - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 2009)