1. ASTM 2010. Standard test method for compressive strength and elastic moduli of intact rock core specimens under varying states of stress and temperature. ASTM D7012-10. ASTM Book of Standards, V. 04.09. American Society for Testing and Materials, West Conshohocken, PA.
2. Bieniawski, Z.T. 1989. Engineering Rock Mass Classifications. Wiley, New York.
3. BSI 2004. Eurocode 7: Geotechnical Design – Part 1: General rules. British Standards Institution, London.
4. BSI 2007. BS EN 1997-2:2007, Eurocode 7: Geotechnical Design – Part 2: Ground investigation and testing. British Standards Institution, London.
5. BSI 2010. BS 5930:1999 + A2:2010. Code of practice for site investigation. British Standards Institution, London.