Novotny, V. <https://pure.iiasa.ac.at/view/iiasa/2249.html> & Somlyody, L. <https://pure.iiasa.ac.at/view/iiasa/1584.html>  (1995).  Remediation and Management of Degraded River Basins with Emphasis on Central and Eastern Europe.     Heidelberg: Springer-Verlag.  ISBN 978-3-642-57752-9