Gandul Rojas, B., L. Gallardo Guerrero, J. Garrido Fernández, and M. I. Mínguez Mosquera. 1991. “Control of Chlorophyllic and Carotenoid Pigments by HPLC in Virgin Olive Oil”. Grasas Y Aceites 42 (1):56-60. https://doi.org/10.3989/gya.1991.v42.i1.1279.