Boundary conditions for general ordinary differential operators and their adjoints WDESE Ibrahim Proceedings of the Royal Society of Edinburgh A 114, 99-117, 1990 | 41 | 1990 |

Singular non-selfadjoint differential operators SE Ibrahim Proceeding of the Royal Society of Edinburgh, A 124, 825-841, 1994 | 14 | 1994 |

Boundedness and L2-boundedness of solutions of general quasi-integro differential equations SE Ibrahim International Journal of Applied Mathematics 2 (6), 689-711, 2000 | 11* | 2000 |

The spectra of well-posed operators SE Ibrahim Proceedings of the Royal Society of Edinburgh Section A: Mathematics 125 (6 …, 1995 | 11 | 1995 |

Boundedness for solutions of general ordinary quasi-differential equations SE Ibrahim Journal of Egyptian Mathematical Society 2, 33-44, 1994 | 11 | 1994 |

Problems associated with differential operators SE Ibrahim Ph. D. Degree 1990, 1990 | 10 | 1990 |

The point spectra and regularity fields of products quasi-differential operators SE Ibrahim Indian Journal of Pure and Applied Mathematics 31 (6), 647-665, 2000 | 9* | 2000 |

On the essential spectra of regularly solvable operators in the direct sum spaces SES Ibrahim The Rocky Mountain journal of mathematics, 609-644, 1999 | 9 | 1999 |

On the product of self-adjoint Sturm-Liouville differential operators in direct sum spaces SES Ibrahim Journal of Informatics and Mathematical Sciences 3 (1), 93-109, 2012 | 8 | 2012 |

On boundary conditions for Sturm-Liouville differential operators in the direct sum spaces SES Ibrahim The Rocky Mountain Journal of Mathematics, 873-892, 1999 | 8 | 1999 |

On the essential spectra of general differential operators SES IBRAHIM Italian journal of pure and applied mathematics, 45-67, 2001 | 7 | 2001 |

Non Self-Adjoint Quasi-Differential Operators with Discrete Spectra SE Ibrahim The Rocky Mountain Journal of Mathematics 25 (3), 1053-1078, 1995 | 7 | 1995 |

The point spectra and regularity fields of non-selfadjoint quasi-differential operators SE Ibrahim Rocky Mountain Journal of Mathematics 25 (2), 685-699, 1995 | 6 | 1995 |

On the boundary conditions for products of general quasi-differential operators in direct sum spaces SE Ibrahim International Journal of Applied Mathematics 22 (1), 55-87, 2009 | 5 | 2009 |

The spectra of general differential operators in the direct sum spaces SE Ibrahim Czechoslovak Mathematical Journal 54 (1), 9-29, 2004 | 5 | 2004 |

On the Lw2-boundedness of solutions for products of quasi-integro differential equations SES Ibrahim International Journal of Mathematics and Mathematical Sciences 2003 (10 …, 2003 | 4 | 2003 |

On -quasi-derivatives for solutions of perturbed general quasi-differential equations SE Ibrahim Czechoslovak Mathematical Journal 49 (4), 877-890, 1999 | 4 | 1999 |

On the integrable solutions of product integro differential equations in direct sum spaces SE Ibrahim Journal of Mathematical Sciences: Advances and Applications 27, 11-41, 2014 | 3* | 2014 |

On the essential spectra for products of the general quasi-differential operators and their adjoints SE Ibrahim International Journal of Pure and Applied Mathematics 70 (5), 659-689, 2011 | 3 | 2011 |

On the spectra of non-selfadjoint differential operators and their adjoints in direct sum spaces SES Ibrahim International Journal of Mathematics and Mathematical Sciences 2003 (9), 557-574, 2003 | 3 | 2003 |