1. Etiology of the discoloration of teeth;Fitch;Dent Cosmos,1861
2. Bleaching;White;Dent Reg West,1861
3. Hydrogen dioxide;Harlan;ADA Trans,1882
4. Bleaching teeth by electricity;Westlake;Am J Dent Sci,1895
5. Removing stains from mottled enamel;Ames;JADA and Dent Cosmos,1937