The Ecological Status of European Rivers: Evaluation and Intercalibration of Assessment Methods - Martens, K.; Furse, M.T; Furse, Mike T.; Andrea Buffagni; Bracbec, Karel; Daniel Hering; Karel Brabec; Leonard Sandin; Piet Verdonschot; Brabec, Karel; Buffagni, Andrea; Hering, Daniel; et al. (Springer Netherlands, 2006)