BURBARELLI, RODRIGO C., et al. “MICROBIOLOGICAL EVALUATION OF THE SOIL IN IRRIGATED AREA WITH EFFLUENT POND STABILIZATION”. Revista Brasileira De Engenharia De Biossistemas, vol. 3, no. 3, Nov. 2009, pp. 201-8, doi:10.18011/bioeng2009v3n3p201-208.