Divergence-free Wavelets for Coherent Vortex Extraction in 3D homogeneous isotropic turbulenceErwan Deriaz, Margarete O. Domingues, Valérie Perrier, Kai Schneider and Marie FargeESAIM: Proc., 16 (2007) 146-163DOI: https://doi.org/10.1051/proc:2007011