Castillo, R. C. J., V. M. Mendoza, J. E. Lope, and R. Mendoza. “Modeling Infectious Disease Trend Using Sobolev Polynomials”. Communication in Biomathematical Sciences, vol. 6, no. 2, Dec. 2023, pp. 100-7, doi:10.5614/cbms.2023.6.2.2.