@book{27440,
	author = {Hudson, J. A. },
	title = {Comprehensive Rock Engineering : Principles, Practice and Projects ( Volume 4 – Excavation, Support, and Monitoring    ) /},
	publisher = {Pergamon Press,},
	year = {1993},
	address = {Oxford :},
	edition = {1st.ed.},
	note = {Vols. 1-5 have on the cover: senior editors, Edwin T. Brown, Charles Fairhurst & Evert Hoek.}
}