1. Bacteriological Infection in Pulps of Pyorrhetic Teeth;Colyer;Br. Dent. J,1924
2. The Pathology of Pulps Found in Pyorrhetic Teeth;Cahn;Dent. Items Int,1927
3. L'Histologie Pathologique de la Pulpa dans la Parodontose;Fischer,1931
4. Pathology of the Dental Pulp;Hill;J. Am. Dent. Assoc,1934
5. Incidence of Pulpal Infection in Periodontoclasia;Canby;J. Am. Dent. Assoc,1936