@article {31236,
	title = {An evaluation of the underground approach to oil sand development. Presented at the AOSTRA Seminar on Underground Excavation in oil sands, Edmonton, May 19, 1978, edited by M. B. Dusseault},
	volume = {Paper No. 6},
	year = {1978},
	institution = {Alberta Oil Sands Technology and Research Authority},
	author = {Stephenson, H. G.}
}
