Application of Aquifer Vulnerability Index (AVI) method to assess groundwater vulnerability to contamination in Semarang urban areaThomas Triadi Putranto, Narulita Santi, Dian Agus Widiarso and Dimas PamungkasMATEC Web of Conferences, 159 (2018) 01036DOI: https://doi.org/10.1051/matecconf/201815901036