Suazo, F., J. Vásquez, M. Retamal, L. Ascar, and A. Giordano. “PHARMACEUTICAL COMPOUNDS DETERMINATION IN WATER SAMPLES: COMPARISON BETWEEN SOLID PHASE EXTRACTION AND STIR BAR SORPTIVE EXTRACTION”. Journal of the Chilean Chemical Society, Vol. 62, no. 3, Sept. 2017, https://www.jcchems.com/index.php/JCCHEMS/article/view/318.