@inproceedings{852e5cfd8ae24881b8fe687cf0d3efad,
title = "Rock mass strength by rock mass classification",
keywords = "ADLIB-ART-669, ESA",
author = "H.R.G.K. Hack",
year = "1997",
language = "English",
pages = "346--356",
editor = "{G{\"u}rtunca }, R.G. and T.O. Hagan",
booktitle = "SARES'97 : 1st southern African rock engineering symposium proceedings, Johannesburg, South Africa, 15-17 September 1997 / R.G. G{\"u}rtunca and T.O. Hagan (eds.) pp. 346-356",
publisher = "SARES",
address = "South Africa",
}