Mutagenicity and DNA adduct formation of PAH, nitro-PAH, and oxy-PAH fractions of atmospheric particulate matter from São Paulo, Brazil - Umbuzeiro, Gisela de Aragão; Franco, Alexandre; Martins, Maria Helena; Kummrow, Fábio; Carvalho, Lilian Rothschild Franco de; Schmeiser, Heinz H; Leykaud, Jutta; Stiborova, Marie; Claxton, Larry D. (Mutation Research, 2008)