1. Force in orthodontics and its relation to tooth movement;Storey;Aust. J. Dent.,1952
2. Root surface area related to anchorage in the Begg technique;Freeman,1965
3. Root surface measurement and a method for x-ray determination of root surface area;Jepsen;Acta Odontol. Scand.,1963
4. The effect of different extraction sites upon incisor retraction;Williams;Am. J. Orthod.,1976
5. Interviews on early treatment;Ricketts;J. Clin. Orthod.,1979