@article{article12d2ebda,
title   = {Rapid determination of nitrogen, phosphorus and potassium in fertilisers by flow injection analysis},
author = {Hansen, E H and Krug, Francisco José and Ghoset, Animesh K and Ruzicka, J},
year = {1977},
doi = {10.1039/an9770200714},
journal   = {Analyst}
}