Guhl E. Humboldt y nosotros. X (41): xlv-xlviii, 1959. Rev. Acad. Colomb. Cienc. Ex. Fis. Nat. [Internet]. 2019 Sep. 25 [cited 2025 Apr. 19];43(168):443-6. Available from: https://raccefyn.co/index.php/raccefyn/article/view/1007