1. Ali, N., Singh, P.K., Peng, CP., Shiralkar, G.S., Moschovidis, Z. and Baack, W.L. (1991), Injection above-parting-pressure water-flood pilot, Valhall Field, Norway. SPE Annual Technical Conference and Exhibition, Dallas, Oct 6–9, SPE 22893.
2. Andersen, M.A. (1992), Enhanced compaction of stressed North Sea Chalk during waterflooding, EUROCAS, Sept.
3. Halvorsen, H. (1991), Porosity reduction as a function of pressure depletion in a high porosity chalk field, Thesis in petroleum engineering at HSR.
4. Z & S Geologi A/S Report;B Hansen,1990
5. Munns, J.W. (1985). The Valhall Field: a geological overview, Marine and Petroleum Geology. 12.