Huarote, E. G., N. G. Herrera, and J. Borquez. “OBTAINING AN ACID-BASE NATURAL INDICATOR FROM THE FRUIT Punica Granatum L. (POMEGRANATE): A CONTRIBUTION FOR THE SUBSTITUTION OF SYNTHETIC INDICATORS.”. Journal of the Chilean Chemical Society, Vol. 64, no. 4, Dec. 2019, pp. 4593-6, https://jcchems.com/index.php/JCCHEMS/article/view/1078.