@article{article28fd0231,
title   = {The São Paulo PIXE system and its use on a national monitoring air quality program},
author = {Orsini, Celso Maria de Queiróz and Artaxo Netto, Paulo Eduardo and Tabacniks, Manfredo Harri},
year = {1982},
doi = {10.1016/0004-6981(82)90287-6},
journal   = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms}
}