Espinel Barajas, K.Y.E.B.Y., Veloza Muñoz, P.E. and León Beltrán, J.A. (2018) “Comfrey as a complement or vitamin substitute for the production of alternative foods in pigs”, Perspectivas, 3(10), pp. 138–144. Available at: https://revistas.uniminuto.edu/index.php/Pers/article/view/1778 (Accessed: 29 October 2026).