查尔斯与骆明庆将社会失衡指标替换为犯罪率，发现对结果没有影响。

Mr Charles and Mr Luoh controlled for crime rates, as a proxy for social dysfunction, and found that it made no difference to their results.

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[10]尤明庆，华安增。岩石试件单轴压缩的破坏形式与承载力的降低[J]。岩石力学与工程学报，1998,17 (3)：292 - 296。

You Mingqins, Hua Anzeng. Fracture of rock specimen and decrement of bearing capacity in uniaxial compression. Mechanics and Engineering, 1998, 17 (3) : 292 -296. [J].

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苏晓明，张庆灵，广义周期时变系统，科学出版社，2006。

Xiaoming SU, Qingling Zhang, Periodic Time Varying Descriptor Systems, Science Press, 2006.

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