URBÁN R., Jorge; GÓMEZ-GALLARDO U., Alejandro; LUDWIG, Stefan. Abundance and mortality of gray whales at Laguna San Ignacio, Mexico, during the 1997-98 El Niño and the 1998-99 La Niña. Geofísica Internacional, [S. l.], v. 42, n. 3, p. 439–446, 2003. DOI: 10.22201/igeof.00167169p.2003.42.3.932. Disponível em: https://revistagi.geofisica.unam.mx/index.php/RGI/article/view/932. Acesso em: 14 ene. 2026.