1. Tissue Changes Incident to Root Canal Treatment;Nygaard-Östby;Det Norske Vitenskapsakademi,1944
2. The Dependence of the Results of Pulp Therapy on Certain Factors;Strindberg;Acta Odontol. Scand,1956
3. Factors Affecting Successful Repair After Root Canal Therapy;Seltzer;J. Am. Dent. Assoc,1963
4. Endodontics;Ingle,1965
5. The Frequency, Technical Standard and Results of Endodontic Therapy;Molven,1974