Robles Medina, A., Molina Grima, E. and García Sánchez, J.L. 1995. Obtaining of polyunsaturated fatty acids concentrates by the urea complexes method. Grasas y Aceites. 46, 3 (Jun. 1995), 174–182. DOI:https://doi.org/10.3989/gya.1995.v46.i3.922.