1. American Petroleum Institute. (1993). RP2A-WSD: Recommended practice of planning designing and constructing fixed offshore platforms—Working stress design 20th Ed.
2. Åstedt B. Weiner L. and Holm G. (1992). “Increase in bearing capacity with time for friction piles in silt and sand.” Proc. Nordic Geotech. Meeting 411–416.
3. Axelsson G. (1998). “Long-term increase in shaft capacity of driven piles in sand.” Proc. 4th Int. Conf. on Case Histories in Geotech. Engrg .
4. “BS 8004 foundations.” (1986). British Standards Instn. London.