@article{Guhl_2019, place={Bogotá, Colombia}, title={Humboldt y nosotros. X (41): xlv-xlviii, 1959}, volume={43}, url={https://raccefyn.co/index.php/raccefyn/article/view/1007}, DOI={10.18257/raccefyn.1007}, number={168}, journal={Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales}, author={Guhl, Ernesto}, year={2019}, month={sep.}, pages={443–446} }