Hämmerle Christoph H F, Jung Ronald E
Clinic for Fixed and Removable Prosthodontics, Center for Dental and Oral Medicine and Cranio-Maxillofacial Surgery, University of Zürich, Switzerland.
Periodontol 2000. 2003;33:36-53. doi: 10.1046/j.0906-6713.2003.03304.x.