Gómez Gómez, R., and A. Vázquez Roncero. “Quantitative Determination of Fatty Esters of 3-Phenylamine- 1,2-Propanediol by Absorption Spectrophotometry”. Grasas Y Aceites, vol. 42, no. 4, Aug. 1991, pp. 281-5, doi:10.3989/gya.1991.v42.i4.1234.