Groundwater vulnerability assessment to pollution in Kasihan, Bantul Regency: A comparative method study (GOD, SINTACS and DRASTIC)Ignasius Loyola Setyawan Purnama and Vincentia Anindha PrimacintyaE3S Web Conf., 200 (2020) 02012DOI: https://doi.org/10.1051/e3sconf/202020002012