1. Studies in the Flora of the Mouth; VI;Ludwig;Australian J. Dent.,1950
2. Van Huysen, Grant: Personal communication.
3. Morphologic Characteristics of Oral Treponemes and Borrelia Vincenti;Hampp;J. Am. Dent. A.,1950
4. The Motile Non-Sporulating Anaerobic Rods of the Oral Cavity;McDonald,1953