Evaluation of mutagenic potential of contaminated atmosphere at Ibirapuera Park, São Paulo - SP, Brazil, using the Tradescantia stamen-hair assay - Ferreira, Maria Izildinha; Domingos, Marisa; Gomes, Heliana de Azevedo; Saldiva, Paulo Hilário Nascimento; Assunção, João Vicente de (Environmental Pollution, 2007)