Article Leonardo, Antonio Jose F.; Martins, Decio R.; Fiolhais, Carlos (2011)
Costa Lobo and the Study of the Sun in Coimbra in the First Half of the Twentieth Century. Journal of Astronomical History and Heritage (p. 41). (/isis/citation/CBB001221508/) unapi

Article Bonifácio, Vitor; Malaquias, Isabel; Fernandes, João (2009)
Taking Internal Advantage of External Events---Two Astronomical Examples from Nineteenth-Century Portugal. Centaurus: International Magazine of the History of Mathematics, Science, and Technology (p. 213). (/isis/citation/CBB000932331/) unapi