1. The Role of the Blood Clot in Endodontic Therapy;Nygaard-Ostby;Acta Odontol. Scand,1961
2. Apical Root Formation in Non-vital Immature Permanent Incisor—Case Report;Ball;Br. Dent. J,1964
3. Root Growth and Apical Repair Subsequent to Pulpal Necrosis in Children;Rule;Br. Dent. J,1966
4. Apex Formation Following Treatment of Necrotized Immature Permanent Incisor;Bouchon;J. Dent. Child,1966
5. Therapy for Divergent Pulpless Teeth by Continued Apical Formation;Frank;J. Am. Dent. Assoc,1966