6Wigfield C, Gill S, Nelson R, et al. Influence of an artificial cervical joint compared with fusion on adjacent-level motion in the treatment of degenerative cervical disc disease. J Neurosurg, 2002,17-21.
7Robertson JT, Papadopoulos SM, Traynelis VC. Assessment of adjacent-segment disease in patients treated with cervical fusion or arthroplasty: a prospective 2-year study. J Neurosurg Spine, 2005,6: 417-423.
8高纶标,高英仪.模糊数学原理及应用.华南理工大学出版社,2003.284-286.
9Zadeh. Fuzzy Sets. Information and control, 1965,8 : 338-353.
