%0 Generic %D 1996 %T Quantitative relationships of invertebrates to pH in Norwegian river systems. %A Larsen, J. %A Birksl, H.J.B, %A Raddum, G. %A Fjellheim, A. %B Hydrobiologica %V 328 %P 57-74 %G eng %0 Generic %D 1995 %T Critical limits of acidification to invertebrates in different regions of Europe. %A Raddum, G. %A Skjelkvale, B.L. %B Water Air and Soil Pollution %V 85 %P 475-480 %G eng