Rúa M., Viviana, et al. “Purine Derivatives Excretion Function in Relation to the Fiber Protein Ratio in the Diet of Alpacas (Vicugna Pacos)”. Revista De Investigaciones Veterinarias Del Perú, vol. 28, no. 1, May 2017, pp. 62-70, https://doi.org/10.15381/rivep.v28i1.12936.