Erizal (2013) “SYNTHESIS AND IMMOBILIZATION OF CAPTOPRILIN HYDROGEL POLYVINYL ALCOHOL-POLYVINYL PIRROLIDONE PREPARED BY FREEZING-THAWAND GAMMA RADIATION”, Jurnal Sains Materi Indonesia, 14(4), pp. 259–265. doi: 10.17146/jsmi.2013.14.4.4383.