1. An engineers guide to friction: defense Metals Information Center, Batelle Memorial Institute, Columbus, Ohio, 1970, DMIC Memorandum 246.
2. Friction;Palmer;Sci Am,1951
3. Evaluation of friction forces in the 0.022 × 0.028 edgewise bracket in vitro;Andreasen;J Biomech,1970
4. Frictional forces in fixed orthodontic appliances;Nicolls;Dent Prac Dent Res,1967
5. Frictional forces of ligated plastic and metal edgewise brackets;Riley;J Dent Res,1979