4Mulligan TF. Commen sense mechanics. CSM. 1982:16.
5Clifford PM,Burden DJ. The effect of inceasing the reverse curve of Spee in a lower arvhwire examined using a dynamic photo-elastic gelatine model. Europe J Orthod. 1999;21(3) :213 .
6Clifford PM,Corr JF,Burden DJ. The effect of inceasing the reverse curve of Spee in a lower arvhwire examined using a dynamic photo-elastic gelatine model. Eur J Orthod, 1999,21:213-222.
7Ferguson JW. Lower incisor torque: the effect of rectangular archwires with a reverse curve of Spee. Br J Orthod, 1990,17:311-315.
8Andrews LF. Straight wire-the concept and appliance.Baltimore: L.A.Wells, 1989.238-242.
9Burstone CJ, Koenig HA. Force systems from an ideal arch . Am J Orthod, 1974 , 65: 270-289.
10Koenig HA, Burstone CJ. Force system from an ideal arch-large deflection consideration. Angle Orthod, 1989,59:11-16.