Guefaifia, Rafik, et al. “Sub/Super/Solutions/Methods/for/a/Class/of/Fractional/Laplacian/Systems”. Discontinuity, Nonlinearity, and Complexity, vol. 13, no. 4, Aug. 2026, pp. 601-7, https://doi.org/10.5890/DNC.2024.12.002.