@article {, title = {A simple and precise method for measuring ammonium in marine and freshwater ecosystems}, journal = {Canadian Journal of Fisheries and Aquatic Science}, volume = {56}, year = {1999}, note = {PD Plum Data}, pages = {1801-1808}, keywords = {ammonium, estuarine, freshwater, LTER-PIE, marine}, doi = {10.1139/f99-128}, author = {Holmes, R. M. and Aminot, A. and Kerouel, R. and Hooker, B.A. and Peterson, B.J.} }