Ocheni, A. U. U., A. S. Moses, O. D. Oyedum, and M. N. Nwohu. “Determination of on-the-Spot Occupational Elf Magnetic Field Levels in Hydro-Electric Power Transmission Switchyards”. Nigerian Journal of Physics, vol. 32, no. 2, Sept. 2023, pp. 72-79, https://njp.nipngr.org/index.php/njp/article/view/84.