@article {31333,
	title = {Deep excavation in oil sand - why, where, how. Presented at the AOSTRA Seminar on Underground Excavation in oil sands, Edmonton, May 19, 1978, edited by M. B. Dusseault},
	volume = {Paper No. 12},
	year = {1978},
	institution = {Alberta Oil Sands Technology and Research Authority},
	author = {Brooker, E. W. and Devenny, D. W. and MacRae, A. M.}
}
