Chen, A.A. and Mucci, J.L.N. 2012. Frequency of helminth contamination in child day care playgrounds in the city of Varzea Paulista, Sao Paulo, Brazil. Revista de Patologia Tropical / Journal of Tropical Pathology. 41, 2 (Jul. 2012). DOI:https://doi.org/10.5216/rpt.v41i2.19329.