1. Nightguard vital bleaching;Haywood;Quintessence Int,1989
2. Nightguard vital bleaching: how safe is it?;Haywood;Quintessence Int,1991
3. What about whiteners? safety concerns explored;Berry;JADA,1990
4. Duration of tooth color change after bleaching;Rosenstiel;JADA,1991
5. Recommendations on uniform colour spaces, colour terms;Commission Internationale de L’Eclairage,1978