Payamani, A. et al. 2020. Applying various satellite image processing methods on Aster and Landsat ETM+ data to identify and separate the alteration zones around gold mine of Akhtarchi, Khomein, Iran. Nexo Revista Científica. 33, 02 (Dec. 2020), 490–510. DOI:https://doi.org/10.5377/nexo.v33i02.10787.