H alpha rotation curves of Low Surface Brightness galaxies
  We present high-resolution rotation curves of a sample of 26 low surface brightness galaxies. From these curves we derive mass distributions using a variety of assumptions for the stellar mass-to-light ratio. We show that the predictions of current Cold Dark Matter models for the density profiles of dark matter halos are inconsistent with the observed curves. The latter indicate a core-dominated structure, rather than the theoretically preferred cuspy structure. 
W.J.G. de Blok (1), A. Bosma (2) ((1) ATNF, Sydney, Australia (2)   Observatoire de Marseille, France)