1. Root canal therapy in non-vital teeth with open apices;Cooke;Br Dent J,1960
2. The role of the blood clot in endodontic therapy;Nygaard-Östby;Acta Odontol Scand,1961
3. Root canal therapy in incisor teeth with open apices;Stewart;Br Dent J,1963
4. Therapy for the divergent pulpless tooth by continued apical formation;Frank;JADA,1966
5. Root canal morphology in incisor teeth in the 6–15 year old child;Friend;J Br Ended Soc,1969