Sulfided catalysts based on apatite modified by adding zirconium ions: Characterization and catalytical behaviour M. Aït Chaoui, A. El Ouassouli, A. Ezzamarty, M. Lakhdar, C. Moreau, J. Leglise et A. Travert J. Phys. IV France, 123 (2005) 319-322 DOI: 10.1051/jp4:2005123057