?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.jafrearsci.2015.09.016&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=I.&rft.aulast=Ismail&rft.au=Ismail%2C+I.&rft.issn=1464343X&rft.atitle=Origin+of+fluorite+mineralizations+in+the+Nuba+Mountains%2C+Sudan+and+their+rare+earth+element+geochemistry&rft.title=Journal+of+African+Earth+Sciences&rft.date=2015&rft.pages=276-286&rft.volume=112&rft.genre=article