1. Differential force in orthodontic treatment;Begg;Am. J. Orthod.,1956
2. The hidden force;McDowell;Angle Orthod.,1967
3. Reciprocal reverse torquing auxiliaries for the Begg technique;Sain;J. Pract. Orthod.,1969
4. Correspondence teaching;Brandt;Austr. Orthod. Bull.,1967
5. Begg orthodontic theory and technique;Begg,1965