LEHMAN, I. On Lg as read in North American records. Annals of Geophysics, [S. l.], v. 10, n. 1-2, p. 1–21, 1957. DOI: 10.4401/ag-5874. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/5874. Acesso em: 21 feb. 2024.