1. A retrospective multicenter evaluation of osseointegrated implants supporting overdentures;Engquist;Int J Oral Maxillofac Implants,1988
2. Endosseous cylinder implants in severely atrophic mandibles;Triplett;Int J Oral Maxillofac Implants,1991
3. A multicenter study of overdentures supported by Brånemark implants;Johns;Int J Oral Maxillofac Implants,1992