Lindhjem, Henrik and Navrud, Ståle (2010): Can cheap panel-based internet surveys substitute costly in-person interviews in CV surveys? Unpublished.
Lindhjem, Henrik and Navrud, Stale (2011): Using Internet in Stated Preference Surveys: A Review and Comparison of Survey Modes. Published in: International Review of Environmental and Resource Economics No. 5 : pp. 309-351.
