Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) T.A. Moore and J.C. Ferm,"Composition and grain size of an eocene coal bed in southeastern Kalimantan, Indonesia",International Journal of Coal Geology,0166-5162,Elsevier BV,1992-06,21,1-2,1-30,https://cir.nii.ac.jp/crid/1360302868766377856,https://doi.org/10.1016/0166-5162(92)90033-s