1. EEA
, Water Resources: Quantity and Flows–State and Outlook 2010 Thematic Assessment, ISBN 978-92-9213-162-3, 2010, p. 32
2. EEA
, European Waters–Current Status and Future Challenges–a Synthesis, ISBN 978-92-9213-341-2, 2012, p. 52
3. EEA
, The European Environment—State and Outlook 2010: Synthesis. European Environment Agency, Copenhagen, ISBN 978-92-9213-114-2, 2010, p. 222
4. EEA
, Air Quality in Europe—2014, ISBN 978-92-9213-490-7, 2014, pp. 80
5. ‘Heavy metal’—time to move on from semantics to pragmatics?