On the *A*-obstacle problem and the Hausdorff measure of its free boundaryS Challal, A Lyaghfouri, JF Rodrigues Annali di Matematica Pura ed Applicata 191, 113-165, 2012 | 49 | 2012 |

The inhomogeneous dam problem with linear Darcy’s law and Dirichlet boundary conditions A Lyaghfouri Mathematical Models and Methods in Applied Sciences 6 (08), 1051-1077, 1996 | 34 | 1996 |

The dam problem for linear Darcy's law and nonlinear leaky boundary conditions M Chipot, A Lyaghfouri | 33 | 1998 |

The dam problem for non‐linear Darcy's laws and non‐linear leaky boundary conditions M Chipot, A Lyaghfouri Mathematical Methods in the Applied Sciences 20 (12), 1045-1068, 1997 | 30 | 1997 |

A filtration problem through a heterogeneous porous medium S Challal, A Lyaghfouri Interfaces and Free Boundaries 6 (1), 55-79, 2004 | 26 | 2004 |

The dam problem for nonlinear Darcy's laws and Dirichlet boundary conditions J Carrillo, A Lyaghfouri Annali della Scuola Normale Superiore di Pisa-Classe di Scienze 26 (3), 453-505, 1998 | 24 | 1998 |

On the continuity of the free boundary in problems of type div (a (x)∇ u)=-(h (x) χ (u)) x1 S Challal, A Lyaghfouri Nonlinear Analysis: Theory, Methods & Applications 62 (2), 283-300, 2005 | 23 | 2005 |

Porosity of free boundaries in A-obstacle problems S Challal, A Lyaghfouri Nonlinear Analysis: Theory, Methods & Applications 70 (7), 2772-2778, 2009 | 21 | 2009 |

A unified formulation for the dam problem A Lyaghfouri Rivista di Matematica della Universita di Parma.(6) 1, 113-148, 1998 | 21 | 1998 |

On the regularity of the free boundary for quasilinear obstacle problems S Challal, A Lyaghfouri, JF Rodrigues, R Teymurazyan Interfaces and Free Boundaries 16 (3), 359-394, 2014 | 19 | 2014 |

Second order regularity for the *p*(*x*)‐Laplace operatorS Challal, A Lyaghfouri Mathematische Nachrichten 284 (10), 1270-1279, 2011 | 19 | 2011 |

Hölder continuity of solutions to the -Laplace equation involving measures S Challal, A Lyaghfouri Communications on Pure and Applied Analysis 8 (5), 1577-1583, 2009 | 18 | 2009 |

The evolution dam problem for nonlinear Darcy's law and Dirichlet boundary conditions. A Lyaghfouri Portugaliae Mathematica 56 (1), 1-37, 1999 | 18 | 1999 |

On a class of free boundary problems of type S Challal, A Lyaghfouri | 16* | 2006 |

On the Uniqueness of the Solution of a Nonlinear Filtration Problem through a Porous medium A Lyaghfouri Calculus of Variations and Partial Differential Equations 6 (1), 67-94, 1997 | 15 | 1997 |

Hölder continuity of p (x)-superharmonic functions A Lyaghfouri Nonlinear Analysis: Theory, Methods & Applications 73 (8), 2433-2444, 2010 | 14 | 2010 |

Gradient estimates for *p*(*x*)-harmonic functionsS Challal, A Lyaghfouri manuscripta mathematica 131, 403-414, 2010 | 14 | 2010 |

A free boundary problem for a fluid flow in a heterogeneous porous medium A Lyaghfouri Annali dell’Universita di Ferrara 49, 209-262, 2003 | 14 | 2003 |

The heterogeneous dam problem with leaky boundary condition S Challal, A Lyaghfouri Communications on Pure and Applied Analysis 10 (1), 93-125, 2010 | 10 | 2010 |

On the Lipschitz continuity of the solutions of a class of elliptic free boundary problems A Lyaghfouri Journal of Applied Analysis 14 (2), 165-181, 2008 | 10 | 2008 |