RANGARAJAN, G. K. A comparative study of K-indices at three Indian Magnetic stations . MAUSAM, [S. l.], v. 31, n. 3, p. 449–456, 1980. DOI: 10.54302/mausam.v31i3.3793. Disponível em: https://mausamjournal.imd.gov.in/index.php/MAUSAM/article/view/3793. Acesso em: 20 jul. 2025.