فهرست مقالات Fractional calculus \sep Variable-order fractional derivative \sep Fractional differential equations دسترسی آزاد مقاله صفحه چکیده متن کامل 1 - An Efficient Numerical Approach for Approximating Nonlocal Variable-Order Weakly Singular Integro-Differential Equations Nayereh Tanha Behrouz Parsa Moghaddam Mousa Ilie