On the maximal and minimal solutions of arbitrary-orders nonlinear functional integral and differential equations AMA El-Sayed, FM Gaafar, HH Hashem Math. Sci. Res. J 8 (11), 336-348, 2004 | 44 | 2004 |

Fractional calculus and some intermediate physical processes AMA El-Sayed, FM Gaafar Applied Mathematics and Computation 144 (1), 117-126, 2003 | 44 | 2003 |

Fractional-order differential equations with memory and fractional-order relaxation-oscillation model AMA El-Sayed, FM Gaafar Pure Mathematics and Applications 12 (3), 296-310, 2001 | 38* | 2001 |

Stability of a nonlinear non-autonomous fractional order systems with different delays and non-local conditions A El-Sayed, F Gaafar Advances in Difference Equations 2011 (1), 47, 2011 | 16 | 2011 |

A Class of Nonlinear Boundary Value Problems for an Arbitrary Fractional-Order Differential Equation with the Riemann-Stieltjes Functional Integral and Infinite-Point Boundary … H Srivastava, A El-Sayed, F Gaafar Symmetry 10 (10), 508, 2018 | 15 | 2018 |

Stability for a non-local non-autonomous system of fractional order differential equations with delays. A El-Sayed, FM Gaafar, E Hamadalla Electronic Journal of Differential Equations (EJDE)[electronic only] 2010 …, 2010 | 13 | 2010 |

Existence and uniqueness of solution for Sturm–Liouville fractional differential equation with multi-point boundary condition via Caputo derivative AMA El-Sayed, FM Gaafar Advances in Difference Equations 2019 (1), 46, 2019 | 6 | 2019 |

Continuous and integrable solutions of a nonlinear Cauchy problem of fractional order with nonlocal conditions FM Gaafar Journal of the Egyptian Mathematical Society 22 (3), 341-347, 2014 | 5 | 2014 |

Exact solution of linear differential equations of fractional order AMA El-Sayed, FM Gaafar Kyungpook mathematical journal 37 (2), 181-181, 1997 | 5 | 1997 |

Continuous dependence of the solution of Ito stochastic differential equation with nonlocal conditions AMA El-Sayed, F Gaafar, M El-Gendy Applied Mathematical Sciences 10 (40), 1971-1982, 2016 | 4 | 2016 |

Sturm-Liouville equation of fractional order AMA El-Sayed, FM Gaafar Kyungpook mathematical journal 37 (1), 9-9, 1997 | 4 | 1997 |

Positive solutions of singular Hadamard-type fractional differential equations with infinite-point boundary conditions or integral boundary conditions AMA El-Sayed, FM Gaafar Advances in Difference Equations 2019 (1), 382, 2019 | 2 | 2019 |

CAUCHY-TYPE PROBLEMS OF A FUNCTIONAL DIFFERINTEGRAL EQUATIONS WITH ADVANCED ARGUMENTS FM GAAFAR Journal of Fractional Calculus and Applications 5 (2), 71-77, 2014 | 2 | 2014 |

The Existence of Solutions for a Nonlinear First-Order Differential Equation Involving the Riemann–Liouville Fractional-Order and Nonlocal Condition FM Gaafar Mediterranean Journal of Mathematics 15 (5), 191, 2018 | 1 | 2018 |

Existence of Solutions for Singular Second-Order Ordinary Differential Equations with Periodic and Deviated Nonlocal Multipoint Boundary Conditions A El-Sayed, FM Gaafar Journal of Function Spaces 2018, 2018 | 1 | 2018 |

Positive solutions of a quadratic integro-differential equation FM Gaafar Journal of the Egyptian Mathematical Society 22 (2), 162-166, 2014 | 1 | 2014 |

The Existence of Solutions for a Nonlocal Problem of an Implicit Fractional-Order Differential Equation FM Gaafar Journal of the Egyptian Mathematical Society 26 (1), 184-195, 0 | 1* | |

CONTINUOUS DEPENDENCE OF THE SOLUTION OF RANDOM FRACTIONAL–ORDER DIFFERENTIAL EQUATION WITH NONLOCAL CONDITIONS AMA EL-SAYED, F GAAFAR, M EL-GENDY | 1* | |

Correction to: The Existence of Solutions for a Nonlinear First-Order Differential Equation Involving the Riemann–Liouville Fractional-Order and Nonlocal Condition FM Gaafar Mediterranean Journal of Mathematics 16 (1), 2, 2019 | | 2019 |

On the weakly continuous solutions of a coupled system of functional integral equations. AM El-Sayed, RO El Rahman, FM Gaffar, NFM El-haddad Differential Equations & Control Processes, 2016 | | 2016 |