1. Ministry of National Health and Welfare. Guidelines for Canadian Water Quality;Anon,1978
2. Talousveden terveydellisen laadun valvonta.Övervakning av hushållsvattnets hygieniska kvalitet;Anon;Lääkintöhallituksen Yleiskirje—Medicinalstyrelsens Cirkulär Nro/nr 1862,1985
3. Suomen Syöpäkartasto, Atlas of Cancer Incidence in Finland, 1953–1982;Anon;Suomen Syöpärekisteri, Finnish Cancer Registry, Helsinki,1987
4. Anomalously high concentrations of uranium, radium and radon in water from drilled wells in the Helsinki region;Asikainen;Geochim. Cosmochim. Acta,1979
5. Natural radioactivity of ground water and drinking water in Finland;Asikainen,1982