Proceedings of the 11th congress of the international society for rock mechanics, vol. 1 11. Congress of the International Society for Rock Mechanics (ISRM 2007) 11. Congress of the International Society for Rock Mechanics (ISRM 2007), Jul 2007, Lisbonne, Portugal. pp.69-72
Proceedings of the 11th congress of the international society for rock mechanics 11. Congress of the International Society for Rock Mechanics (ISRM 2007) 11. Congress of the International Society for Rock Mechanics (ISRM 2007), Jul 2007, Lisbonne, Portugal. pp.NC