Martínez, F., M. J. Moyano, J. Alba, M. A. Ruiz, F. Hidalgo, and F. J. Heredia. “Rapid Method to Obtain Virgin Olive Oil for Acidity Determination”. Grasas Y Aceites, vol. 50, no. 2, Apr. 1999, pp. 122-6, doi:10.3989/gya.1999.v50.i2.646.