1. Vinyl polysiloxane impression materials: status report;Christensen;Clinical Research Associates Newsletter,1997
2. Complex fixed and implant prosthodontics: making nearly foolproof impressions;Christensen;JADA,1992
3. Now is the time to change to custom impression trays;Christensen;JADA,1994
4. Making better removable partial dentures;Christensen;JADA,1995