G., P. Estudio sobre las ondas superficiales Lg, Rg, y Li en los registros del observatorio de Toledo. Annals of Geophysics, [S. l.], v. 13, n. 3-4, p. 297–325, 1960. DOI: 10.4401/ag-5475. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/5475. Acesso em: 4 aug. 2021.