Gómez Gómez, R., and A. Vázquez Roncero. 1991. “Quantitative Determination of Fatty Esters of 3-Phenylamine- 1,2-Propanediol by Absorption Spectrophotometry”. Grasas Y Aceites 42 (4):281-85. https://doi.org/10.3989/gya.1991.v42.i4.1234.