Year of Publication 2004 Authors (Fieldset) Sheppard, L.J.; Crossley, A.; Leith, I.D.; Hargreaves, K.J.; Carfrae, J. ; Dijk, N.; Cape, J.N.; Sleep, D. ; Fowler, D.; Raven, J.A. Journal/Book Water, Air and Soil Pollution: Focus Volume 4 (6) Pagination 197-205