1. Ekseth, R., Kovalenko, K., Weston, J.L., Torkildsen, T., Nyrnes, E., Brooks, A., Wilson, H. 2006. The Reliability Problem Related to Directional Survey Data. Paper SPE 103734 presented at the IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, Bangkok, Thailand, 13–15 November. doi: 10.2118/103734- MS.
2. Ekseth, R., Torkildsen, T., Brooks, A., Weston, J., Nyrnes, E., Wilson, H., Kovalenko, K. 2007. High-Integrity Wellbore Surveys: Methods for Eliminating Gross Errors. Paper SPE 105558 presented at the SPE/IADC Drilling Conference, Amsterdam, 20–22 February. doi: 10.2118/105558-MS.
3. Ekseth, R., Torkildsen, T., Brooks, A., Weston, J., Nyrnes, E., Wilson, H., Kovalenko, K. 2010. ‘ High Integrity wellbore Surveying’, December 2010 SPE Drilling and Completion, SPE133417.
4. Brooks, A.G., Gurden, P.A., Noy, K.A. 1998. Practical Application of a Multiple-Survey Magnetic Correction Algorithm. Paper SPE 49060 presented at the SPE Annual Technical Conference and Exhibition, New Orleans, 27 September–1 October. doi: 10.2118/49060-MS.
5. Nyrnes E., Torkildsen T., Nahavandchi H. 2005c. Detection of Gross Errors in Wellbore Directional Surveying with Emphasis on Reliability Analyses. Kart Og Plan 65: 98.
6. Nyrnes, E., Torkildsen, T. 2005a. Analysis of the Accuracy and Reliability of Magnetic Directional Surveys. Paper SPE 96211 presented at the SPE/IADC Middle East Drilling Technology Conference and Exhibition, Dubai, 12–14 September. doi: 10.2118/96211-MS.
7. Nyrnes, E., Torkildsen, T., Haarstad, I., Nahavandchi, H. 2005b. Error Properties of Magnetic Surveying Data. Paper presented at the SPWLA 46th Annual Logging Symposium, New Orleans, 27–29 June.
8. Nyrnes, E., Torkildsen, T. and Wilson, H. 2009. Minimum Requirements for Multi-station Analysis of MWD Directional Surveys. Paper SPE 125677 presented at the SPE/IADC Middle East Drilling Technology
Conference and Exhibition, Manama, Bahrain, 26-28 October.
9. Ekseth R. (1998) “Uncertainties in connection with the determination of wellbore positions” ISBN 82-471- 0218-8, doctoral thesis 1998, Norwegian University of Science and Technology, 1998:24 IPT-rapport.
10. Torkildsen T., Harvardstein S.T., Weston J., Ekseth R. (2008) “Prediction of Wellbore Position Accuracy When Surveyed With Gyroscopic Tools”. Paper SPE 90408, SPE Drilling and Completion, March 2008.
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