E. Graciani Constante, F. Rodríguez Berbel, A. Paredes Torronteras, and J. Huesa Lope, “Deacidification by distillation using nitrogen as stripper. Possible application to the refining of edible fats”, Grasas aceites, vol. 42, no. 4, pp. 286–292, Aug. 1991.