?url_ver=Z39.88-2004&rft_id=10.7186%2Fbgsm60201409&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Nugraheni&rft.au=Nugraheni%2C+R.D.&rft.aufirst=R.D.&rft.atitle=Tertiary+coal-bearing+heterolithic+packages+as+low+permeability+reservoir+rocks+in+the+Balingian+Sub-basin%2C+Sarawak%2C+Malaysia&rft.pages=85-93&rft.volume=60&rft.issn=01266187&rft.date=2014&rft.title=Bulletin+of+the+Geological+Society+of+Malaysia&rft.genre=article