?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=M.A.&rft.aulast=Shoieb&rft.au=Shoieb%2C+M.A.&rft.date=2018&rft.title=Petroleum+and+Coal&rft.atitle=Mineralogical+and+petrographic+characterization+of+the+Paleozoic+shale+in+the+Kroh+formation%2C+North+Perak%2C+Peninsular+Malaysia&rft.pages=1021-1028&rft.volume=60&rft.issn=13377027&rft.issue=5&rft.genre=article