1. ASTM International, 1998. Standard Test Method for Radon in Drinking Water. ASTM D5072-98.
2. Radon in homes and risk of lung cancer: collaborative analysis of individual data from 13 European case-control studies;Darby;Br. Med. J.,2005
3. Estonian standard, 2009. Radooniohutu hoone projekteerimine [Design of Radon-Safe Building]. EVS840:2009.
4. European Commission, 2001. Commission Recommendation of 20 December 2001 on the Protection of the Public Against Exposure to Radon in Drinking Water Supplies. 2001/928/Euratom.
5. Forte, M., Rusconi, R., Trotti, F., Caldognetto, E., Airoldi, R., Realini, F., Risica, S., Bagnato, L., 2010. Estimation of Concentrations of Radionuclides in Estonian Ground Waters and Related Health Risks. Final Report (Agenzia Regionale per la Protezione dell׳Ambiente della Lombardia, Milano, 2010). Twinning Light Contract EE06-IB-TWP-ESC-03.