Fonseca Almeida, A. et al. 2009. Adaptation of Ritchie Method for diagnosing Helminthes and Protozoa in samples of sewage silt with chemical substances minimization: DOI: 10.15343/0104-7809.20094427431. O Mundo da Saúde. 33, 4 (Oct. 2009), 427–432.