1. Biologic basis of orthodontics;Gianelly,1971
2. A review of the retention problem;Reidel;Angle Orthod.,1960
3. Relapse of orthodontic treatment;King;Angle Orthod.,1974
4. Retention: An equal partner;Rosenstein;AM. J. Orthod.,1971
5. Bandless but fixed retention;Wolfson;Am. J. Orthod.,1974