Media type: E-Article Title: Discussion Contributor: Coates, D.F; Director General Published: Elsevier BV, 1977 Published in: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 14 (1977) 4, Seite 217 Language: English DOI: 10.1016/0148-9062(77)90951-2 ISSN: 0148-9062 Keywords: General Engineering Origination: Footnote: