C.M. Oppus, M.A.L.G. Guzman, M.L.C. Guico, J.C.N. Monje, M.G.F. Retirado, J.C.T. Kwong, G.C. Ngo, A.J. Domingo "Design of a Remote Real-time Groundwater Level and Water Quality Monitoring System for the Philippine Groundwater Management Plan Project", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1007-1012 (2020).