1. International Atomic Energy Agency. Airborne gamma ray spectrometer surveying. Technical Reports Series No. 323 (Vienna: IAEA) (1991).
2. Ulvsand, T., Finck, R. R. and Lauritzen, B. (eds) NKS/SRV seminar on Barents Rescue 2001 LIVEX gamma search cell. Report No. # NKS-54 (Roskilde, Denmark: Federativ Tryckeri ab) ISBN 87-7893-108-8 (2003).
3. Mellander, H., Aage, H. K., Karlsson, S., Korsbech, U., Lauritzen, B. and Smethurst, M. Mobile gamma spectrometry, evaluation of the resume 99 exercise. Report No. # NKS-56 (Roskilde, Denmark: Pitney Bowes Management Services Denmark A/S) ISBN 87-7893-111-8 (2002).
4. Aage, H. K., Bargholz, K., Korsbech, U., Hovgaard, J. and Ennow, K. An airborne survey of natural radioactivity on Bornholm 1997 and 1999. Report No. IT-NT-47 (Department of Automation, Technical University of Denmark) (1999).
5. Sanderson, D. C. W., Cresswell, A. J. and Lang, J. J., Eds. An international comparison of airborne and ground based gamma ray spectrometry. In: Proceedings of the ECCOMAGS 2002 Exercise, 24 May–4 June 2002, Dumfries and Galloway, Scotland, SUERC (University of Glasgow, Glasgow, Scotland, UK) (2003), ISBN 0 85261 783 6.