Bahat, Feni, Winsy Weku, and Chriestie Montolalu. 2021. “Analysis of Changes in Green Land Cover of North Minahasa Gold Mine With Landsat 8 Images Using the Normalized Difference Vegetation Index”. Operations Research: International Conference Series 2 (4):93-101. https://doi.org/10.47194/orics.v2i4.182.