@conference {104985,
	title = {Screening the factors affecting the oil shale upgrading by flotation, EPRI Conference},
	booktitle = {EPRI},
	year = {2014},
	month = {12 Feb},
	address = {Cairo, Egypt},
	author = {S.E.El-Mofty and A.Al-Kammar and A.A.El-Midany and N.Khairy}
}
