MOORE, Tim A. Stratified Sampling to Define Levels of Petrographic Variation in Coal Beds: Examples from Indonesia and New Zealand. Indonesian Journal on Geoscience, [S. l.], v. 3, n. 1, p. 29–51, 2016. DOI: 10.17014/ijog.3.1.29-51. Disponível em: https://ijog.geologi.esdm.go.id/index.php/IJOG/article/view/256. Acesso em: 6 feb. 2025.