Chieffi, P.P. and Muller, E.E. 1978. Monthly variation of the soil contamination by eggs of Toxocara sp. (Nematoda, Ascaroidea), in the urban area of Londrina country, state of Paraná, Brazil. Instituto Adolfo Lutz Journal - RIAL. 38, 1 (Jun. 1978), 13–16. DOI:https://doi.org/10.53393/rial.1978.38.37112.