1. Ceramic vs. porcelain fused to metal crowns: give your patients a choice;Christensen;JADA,1994
2. The confusing array of tooth-colored crowns;Christensen;JADA,2003
3. Why all-ceramic crowns?;Christensen;JADA,1997
4. Restoration or crown?;Christensen;JADA,1997
5. Sorting out the confusing array of resins in dentistry;Christensen;JADA,1999