@article{articlefef60242,
title   = {Zone trapping in flow injection analysis: Spectrophotometric determination of low levels of ammonium ion in natural waters},
author = {Krug, Francisco José and Reis, Boaventura Freire dos and Giné-Rosias, Maria Fernanda Georgina and Zagatto, Elias Ayres Guidetti and Ferreira, José Roberto and Jacintho, Antonio Octavio},
year = {1983},
journal   = {Analytica Chimica Acta}
}