Campos, Jose Adolfo. “Equatorial "Pazos" of the Valongo Observatory: Origin and Trajectory”. Scientiarum Historia Magazine 1, no. 1 (November 6, 2017): 12. Accessed October 12, 2025. http://bibcegos.nce.ufrj.br/~revistas/index.php/RevistaSH/article/view/151.