New approaches for the capillary electrophoresis determination of benzene metabolites in urine - Coutrim, Mauricio Xavier; Jager, A V; Carvalho, Lilian Rothschild Franco de; Tavares, Marina Franco Maggi (Simposio Latinoamericano Eletroforesis Capilar en Biomedicina, Biofarmacia y Aplicaciones Industriales, 1997)