THE EFFECTS OF POLIVYNIL ALCOHOL (PVA) ON THE SYNTHESIS OF PVA - ZEOLITE - CLAY COMPOSITE AND THE ADSORPTION - DESORPTION TEST OF ETHANOL - WATER MIXTURE - , Indra Cipta , Yateman Arryanto, Sutarno ([Yogyakarta] : Chemistry Departement Universitas Gadjah Mada, 2010)