CHOQUE-QUISPE, D.; LIGARDA-SAMANEZ, C.; RAMOS-PACHECO, B.; SOLANO-REYNOSO, A.; QUISPE-QUISPE, Y. Caffeine and UV-Vis scanning and the water quality index in the high-Andean watershed of the Chumbao River, Andahuaylas, ApurĂ­mac, PerĂș. Chemical Technology, v. 39, n. 3, p. 604-620, 18 out. 2019.