@misc{misc136c820e,
title   = {A PIXE Study of Trace Elements in Sediments of Toledo River, Paraná, Brazil},
author = {Santos, Hellen Cristine dos and Rizzutto, Márcia de Almeida and Added, Nemitala and Espinoza Quinones, Fernando Rodolfo},
year = {2009},
publisher = {AIP},
booktitle   = {Workshop on Nuclear Physics in Brazil}
}