da Silva R. M. P., Caridade S. G., Roman J. S., Mano J. F., and Reis R. L.,  "Permeability of chitosan membranes to small anionic and neutral solutes: dependence on crosslinking and chelation of divalent ions",  4th Marie Curie Cutting Edge Conference. Biocompatibility evaluation and biological behaviour of polymeric biomaterials, 2007.