J. Candia Jr, I. Gonzales, J. Frayco, C. L. Jabel, A. Ronquillo, and Z. G. D. Sambalod, “Covid-19 Risk Model Development Using Fuzzy Logic For The Reopening Of Face-To-Face Classes”, jesa, vol. 2, no. 2, pp. 1–6, Oct. 2025.