Geotechnical engineering of hard soils, soft rocks= La Geotechnique des sols indures, roches tendres : proceedings of an international symposium under the auspices of The International Society for Soil Mechanics and Foundation Engineering (ISSMFE), The International Association of Engineering Geology (IAEG) and the International Society for Rock Mechanics (ISRM), Athens, Greece, 20-23 September 1993 - Αναγνωστόπουλος, Α. (A.A. Balkema, 1993)