@misc{miscb8b6f3e2,
title   = {Flow-injection determination of low levels of ammonium ions in natural waters employing preconcentration with a cation-exchange resin},
author = {Santos Filha, M M and Reis, Boaventura Freire dos and Bergamin Filho, H and Baccan, Nivaldo},
year = {1992},
booktitle   = {International Conference on Flow Analysis}
}