Acidic Pit LakesWalter Geller, Martin Schultze, Bob Kleinmann, Christian Wolkersdorfer · First published 2012Open the Tome
Perspektiven der Ingenieurökologie in Forschung, Lehre, und PraxisWalter Leal Filho, Volker Luderitz, Gunther Geller · First published 2006Open the Tome