Al-Ismail, K. M., and M. A. Humeid. “Influence of Sodium Chloride and Its Combination With Fe (II) or Cu (II) on the Oxidative Alteration of Butter Model Systems”. Grasas Y Aceites, vol. 55, no. 4, Dec. 2004, pp. 394-00, doi:10.3989/gya.2004.v55.i4.206.