1. The porosity and engineering properties of vesicular basalt in Saudi Arabia;Al-Harthi;Engineering Geology,1999
2. Natural Stone Test Methods. Determination of Compressive Strength. EN-1926;Anon,1999
3. Natural Stone Test Methods. Determination of Resistance to Salt Crystallization. EN-12370;Anon,1999
4. Natural Stone Test Methods. Determination of Knoop Hardness. EN-14205;Anon,2004
5. Experimental fracture mechanics data for rocks and minerals;Atkinson,1987