SCHRÖDER , W.; TREDER, H. J. On the existence of solar variations in the 16th to 18th centuries . Geofísica Internacional, [S. l.], v. 38, n. 3, p. 197–201, 1999. DOI: 10.22201/igeof.00167169p.1999.38.3.382. Disponível em: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/646. Acesso em: 3 may. 2024.