Ojeda, C. Bosch, F. Sanchez Rojas, and J.M. Cano Pavon. 2013. “PRECONCENTRATION OF COPPER FROM DIFFERENT SAMPLES BY DISPERSIVE LIQUID-LIQUID MICROEXTRACTION”. European Scientific Journal, ESJ 9 (18). https://doi.org/10.19044/esj.2013.v9n18p%p.