Husnizar, H, Wahyu Wilopo, and Ahmad Tawfiequrrahman Yuliansyah. 2018. “The Prediction of Heavy Metals Lead (Pb) and Zinc (Zn) Contents in Soil Using NIRs Technology and PLSR Regression Method”. Journal of Degraded and Mining Lands Management 5 (3). Malang, Indonesia:1153-59. https://doi.org/10.15243/jdmlm.2018.053.1153.