@article {31630,
	title = {Shaft sinking and tunnelling in the oil sands of Alberta. Presented at the AOSTRA Seminar on Underground Excavation in oil sands, Edmonton, May 19, 1978, edited by M. B. Dusseault},
	volume = {Paper No. 11},
	year = {1978},
	institution = {Alberta Oil Sands Technology and Research Authority},
	author = {Roesner, E. K. and Poppen, S. A.}
}
