Akanni, J., O. T. Oraiye, A. A. Isa, and O. Ogunbiyi. “Propagation Loss Determination of GSM Signal Strength in Selected Buildings in Ilorin, Nigeria”. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, Vol. 17, no. 3, Sept. 2021, pp. 371-80, https://azojete.com.ng/index.php/azojete/article/view/450.