Okoro, O. N., Agbo, G. A., Ekpe, J. E., & Obiekezie, T. N. (2012). Comparison of hourly variations of radio refractivity for quiet and disturbed days during dry and rainy seasons at Minna. International Journal of Basic and Applied Sciences, 2(1), 58-63. https://doi.org/10.14419/ijbas.v2i1.541