Al-Akhaly إ. ع. . The International Geomagnetic Reference Field in Yemen at the Beginning of 2020 and The Secular Variations during the Period from 1900 to 2020. Journal of Pure & Applied Sciences , [S. l.], v. 20, n. 1, p. 153–166, 2021. DOI: 10.51984/jopas.v20i1.1181. Disponível em: https://sebhau.edu.ly/journal/jopas/article/view/1181. Acesso em: 24 nov. 2024.