@article {37175,
	title = {The use of tilting table to determine the basic friction angle of hard rock surfaces},
	volume = {26},
	year = {1989},
	pages = {474-479},
	publisher = {Canadian Geotechnical Journal },
	url = {http://article.pubs.nrc-cnrc.gc.ca/RPAS/RPViewDoc?_handler_=HandleInitialGet\&calyLang=eng\&journal=cgj\&volume=26\&articleFile=t89-060.pdf},
	author = {Bruce, I. G. and Cruden, D. M. and Eaton, T. M.}
}
