@book{27641,
	author = { International Symposium on Geotechnical Stability in Surface Mining (1986 ) and Singhal, Raj K.},
	title = {Geotechnical Stability In Surface Mining : Proceedings Of The International Symposium On Geotechnical Stability In Surface Mining, Calgary, 6 - 7 November 1986 / },
	publisher = {A. A. Balkema,},
	year = {1986},
	address = {Boston :}
}