Putro, Surya Damar Sasongko, and Wahyu Wilopo. 2022. “Assessment of Nitrate Contamination and Its Factors in the Urban Area of Yogyakarta, Indonesia”. Journal of Degraded and Mining Lands Management 9 (4). Malang, Indonesia:3643-52. https://doi.org/10.15243/jdmlm.2022.094.3643.