López Martínez, Mª.C., y R. García Villanova. 1968. «Possibilities for the Determination of Acids of Fats and Vegetable Oils by Indirect Complexometry With Pb (II) and Establishment of a New Index in Them Called “Complexometric”. II.- Determination of Olive, Soy, Peanut, Sunflower and Cotton Oils». Ars Pharmaceutica (Internet) 9 (11-12):425-32. https://revistaseug.ugr.es/index.php/ars/article/view/7807.