2011. Vegetal test-system investigation on cytotoxicity of water from urban streams located in the northeastern region of Maringá, Paraná State, Brazil - doi: 10.4025/actascibiolsci.v33i1.4924. Acta Scientiarum. Biological Sciences. 33, 1 (fev. 2011), 71–77. DOI:https://doi.org/10.4025/actascibiolsci.v33i1.4924.