Udías 2013, p. 191. Udías, Agustín (2013), "Development Of Seismology In Spain In The Context Of The Three Large Earthquakes Of 1755, 1884 And 1954", Earth Sciences History, 32 (2), History of Earth Sciences Society: 186–203, doi:10.17704/eshi.32.2.f1168212m214l532, JSTOR24140011
Udías 2013, p. 194. Udías, Agustín (2013), "Development Of Seismology In Spain In The Context Of The Three Large Earthquakes Of 1755, 1884 And 1954", Earth Sciences History, 32 (2), History of Earth Sciences Society: 186–203, doi:10.17704/eshi.32.2.f1168212m214l532, JSTOR24140011
Udías 2013, p. 196. Udías, Agustín (2013), "Development Of Seismology In Spain In The Context Of The Three Large Earthquakes Of 1755, 1884 And 1954", Earth Sciences History, 32 (2), History of Earth Sciences Society: 186–203, doi:10.17704/eshi.32.2.f1168212m214l532, JSTOR24140011
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Udías 2013, p. 191. Udías, Agustín (2013), "Development Of Seismology In Spain In The Context Of The Three Large Earthquakes Of 1755, 1884 And 1954", Earth Sciences History, 32 (2), History of Earth Sciences Society: 186–203, doi:10.17704/eshi.32.2.f1168212m214l532, JSTOR24140011
Udías 2013, p. 194. Udías, Agustín (2013), "Development Of Seismology In Spain In The Context Of The Three Large Earthquakes Of 1755, 1884 And 1954", Earth Sciences History, 32 (2), History of Earth Sciences Society: 186–203, doi:10.17704/eshi.32.2.f1168212m214l532, JSTOR24140011
Udías 2013, p. 196. Udías, Agustín (2013), "Development Of Seismology In Spain In The Context Of The Three Large Earthquakes Of 1755, 1884 And 1954", Earth Sciences History, 32 (2), History of Earth Sciences Society: 186–203, doi:10.17704/eshi.32.2.f1168212m214l532, JSTOR24140011