1. Billmeyer and Saltzman's principles of color technology;Berns,2000
2. Rare earth oxide-containing fluorescent glass filler for composite resin;Uo;Dent Mater J,2005
3. Color for science, art and technology,1997
4. The total luminescence of bovine and human dental enamel;Spitzer;Calcif Tissue Res,1976
5. Commission Internationale de l'Eclairage (CIE). Colorimetry Technical Report. CIE Pub. No.15, 2nd ed. Vienna, Austria: Bureau Central de la CIE, 1986 (Reprint 1996).