L'incompressibilite des feuilles de germes de feuilletages holomorphes   singuliers
  We consider a non-dicritic germ of foliations defined in some ball, with finite number of separatrices and satisfying some additional but generic hypothesis. We prove that there exists an open neighborhood U of the total separatice set S such that each leaf of foliaion restrict to (U-S) is incompressible in (U-S). 
David Marin, Jean-Francois Mattei