1. Principles and practice of endodontics;Walton,1989
2. Perborate as a bleaching agent;Salvas;J Am Dent Assoc,1938
3. A simple bleaching technique using sodium perborate;Spasser;NY State Dent J,1961
4. A new combination for bleaching teeth;Nutting;J South Calif Dent Assoc,1963
5. The effect of concentrated hydrogen peroxide solutions on the surface morphology of human tooth enamel;Titley;J Endodon,1988