Measurements of atmospheric carboxylic acids and carbonyl compounds in São Paulo City, Brazil - Montero, L.; Vasconcellos, Pérola de Castro; Souza, S. R.; Pires, M. A. F.; Sanchez Ccoyllo, Ódon Román; Andrade, Maria de Fátima; Carvalho, Lilian Rothschild Franco de (Environmental Science & Technology, 2001)