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Determination of Refractivity Gradient and Modified Refractivity Gradient for Cross River State. International Journal of Sustainable Energy and Environmental Research, [S. l.], v. 7, n. 2, p. 53–64, 2019. DOI: 10.18488/journal.13.2018.72.53.64. Disponível em: https://archive.conscientiabeam.com/index.php/13/article/view/2128. Acesso em: 14 sep. 2026.