?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=O.B.&rft.au=Esther%2C+O.B.&rft.aulast=Esther&rft.isbn=9781613996812&rft.title=Petrographic+characterization+of+black+shales+from+belata+formation%2C+peninsular+Malaysia%3A+Implication+for+fracability&rft.date=2020&rft.genre=proceeding