FERRARI, G. Letters in the Earth Sciences: their historic value and present-day scientific relevance. Annals of Geophysics, [S. l.], v. 45, n. 5, 2002. DOI: 10.4401/ag-3530. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3530. Acesso em: 19 oct. 2021.