@article {30976,
	title = {Pilot plant investigation of thermal hydrocracking of Athabasca bitumen : 2. effect of recycle of heavy oil on product quality},
	volume = {Canada CANMET report 77-20},
	year = {1977},
	pages = {18},
	institution = {Canada Centre for Mineral and Energy Technology},
	author = {Khulbe, C. P. and Pruden, B. B. and Denis, J. M.}
}
