1. Deposits upon teeth with special reference to green and metallic deposits;Miller;D. Cosmos,1894
2. Green stains;Ayers;J.A.D.A.,1939
3. A clinical study of green stains;Springer;Tufts D. Outlook,1944
4. The Prevention of Dental Caries and Oral Sepsis;Pickerill,1924
5. A study of a pigmented dental plaque;Bibby;J. D. Res,1931