Ramírez Espitia, E. J., H. Hurtado Giraldo, and E. Gómez Ramírez. “ Histology and Morphometry of the Digestive Tract in the Fish Pterophyllum Scalare (Perciformes: Cichlidae)”. Revista De Biología Tropical, vol. 68, no. 4, Dec. 2020, pp. 1371–1383, doi:10.15517/rbt.v68i4.40393.