C.V. Ikwuagwu, I.E. Okoh, S.A. Ajah, C.U. Ogbuka, G.O. Unachukwu, E.C. Ejiogu "Development of Electric Power Availability Recorder for Accurate Energy Billing of Unmetered Facilities", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 3, pp. 7-14 (2021).