1. Engineering classification of rock masses for the design of tunnel support;Barton;Rock Mechanics,1974
2. A methodology for assessing geotechnical hazards for TBM tunneling — illustrated by the Athens Metro, Greece;Benardos;International Journal of Rock Mechanics and Mining Sciences,2004
3. Engineering classification of jointed rock masses;Bieniawski;Transactions of the South African Institution of Civil Engineers,1973
4. Engineering rock mass classifications;Bieniawski,1989
5. Technical description of cores for engineering purposes;Deere;Rock Mechanics and Engineering Geology,1964