?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=N.A.F.&rft.aulast=El-Khatib&rft.au=El-Khatib%2C+N.A.F.&rft.isbn=9781618392633&rft.title=The+modification+of+the+Dykstra-Parsons+method+for+inclined+stratified+reservoirs&rft.date=2011&rft.genre=proceeding