[1] E Cosserat,F Cosserat.Theorie Des Corps Deformables.Paris:Hermann et Fils,1909

[2] R A Toupin.Elastic materials with couple stresses.Arch Rat Mech Anal,1962,11:385~414

[3] R D Mindlin,H F Tiersten.Effects of couple stresses in linear elasticity.Arch Rat Mech Anal,1962,11:415~448

[4] R D Mindlin.Influence of couple stresses on stress concentrations.Exp Mech,1963,3:1~7

[5] A C Eringen.Linear theory of micropolar elasticity.J Math Mech,1966,15:909~923

[6] A C Eringen.Theory of micropolar elasticity.In:H Liebowitz ed.Fracture.Vol. 2.New York:Academic Press,1968

[7] W T Koiter.Couple stresses in the theory of elasticity,Ⅰand Ⅱ.Proc Royal Netherlands Acad Sci,Series B,1964,LXVII:17~44

[8] N A Fleck,G M Muller,M F Ashby,J W Hutchinson.Strain gradient plasticity:Theory and experiment.Acta Metall Mater,1994,42:475~487

[9] S Itou.The effect of couple-stresses on the stress concentration around an elliptic Hole.Acta Mech,1973,16:289~296

[10] E Sternberg,R Muki.The effect of couple-stresses on the stress concentration around a crack.Int J Solids Struct,1967,3:69~95

[11] L R Herrmann.Mixed finite elements for couple-stress analysis.In:S N Atluri et al. eds.Hybrid and Mixed Finite Element Methods.New York:Wiley,1983.1~17

[12] R D Wood.Finite element analysis of plane couple-stress problems using first order stress functions.Int J Num Meth Eng,1988,26:489~509

[13] C C Wu,M G Huang,T H H Pian,Constistency condition and convergence criteria of incompatible elements:general formulation of incompatible functions and its application.Comp Struct,1987,27:639~644