1. Aarhus County (2001) Tunø status report 1989?1999. Environmental Division, Aarhus County http://www.nm.aaa.dk/publikat/pdf/Tuno_eng.pdf
2. Christensen NB, Sørensen KI (1998) Surface and borehole electric and electromagnetic methods for hydrogeophysical investigations. Eur J Environ Eng Geophys 3(1):75?90
3. Danish EPA (1999) Consolidated Act No. 130 of 26 February 1999 on Water Supply etc. as amended by section 10 of Act No. 355 of 2 June 1999 and Act No. 374 of 2 June 1999. http://www.mst.dk/homepage
4. Danish EPA (2000a) Statutory Order No. 494 of 28 May 2000 on groundwater protection plans (in Danish). Danish EPA
5. Danish EPA (2000b) Zonation. Detailed mapping of zones for protecting the groundwater resources (in Danish). Danish EPA Guideline no 3