2J. O. Hallpoist, G. L. Goudreau and D. J. Benson, sliding interfaces with contact- impact in largescale Lagrangian computations[J]. Computer methods in applied mechanics and engineering 1985,51 : 107-137.
3H. Parisch, A consistent tangent stiffness matrix for three dimensional nonlinear contact analysis [J]. International Journal for Numerical Methods in Engineering, 1989, 28: 1803-1812.