List of Articles Fractional calculus \sep Variable-order fractional derivative \sep Fractional differential equations Open Access Article Abstract Page Full-Text 1 - An Efficient Numerical Approach for Approximating Nonlocal Variable-Order Weakly Singular Integro-Differential Equations Nayereh Tanha Behrouz Parsa Moghaddam Mousa Ilie https://doi.org/10.82521/IJO.2023.1186181