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2. (2017) www.enviroportal.sk http://www1.enviroportal.sk/indikatory/detail.php?id_indikator=1624
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4. Lieskovská Z, Némethová M et al (eds) (2016) Report on the State of the Environment of the Slovak Republic in 2015. The Ministry of the Environment of the Slovak Republic, Slovak Environmental Agency, Bratislava, p 236. ISBN 978-80-89503-60-5
5. Rapant S, Vrana K, Bodiš D (1996) Geochemical atlas of Slovakia-part I. Groundwater. Ministry of the Environment of the Slovak Republic, Geological Survey of Slovak Republic, Bratislava, p 127. ISBN 80-85314-67-3