“HEAVY METAL CHARACTERISTICS OF WASTEWATER FROM BATIK INDUSTRY IN YOGYAKARTA AREA, INDONESIA”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 20, no. 80, pp. 59–67, Apr. 2021, Accessed: Apr. 18, 2026. [Online]. Available: https://geomatejournal.com/geomate/article/view/299