1. Miller, W. D.: Mikroorganisms en der Mundhoehle, Thieme, Leipsic.
2. Chemical Studies of the Relations of Oral Micro-Organisms to Dental Caries;Gies;J. Allied Dent. Soc,1915
3. Kligler, I. J.: Biochemical Study and Differentiation of Oral Bacteria with Special Reference to Dental Caries, ibid., p. 141.
4. Referendum of Reports on the Cultivation of Various Mouth Micro-Organisms;ibid,1915
5. Further Remarks on Racemosa Leptothrix and Cryptogamic Flora of the Mouth;Vicentini;Dent. Cosmos,1900