Liyu Huang Pei Zhang Jianchun Xu Weirong Wang Complexity Analysis of Gait Time Series under the Different Physiological States. 1-4 2009 BMEI http://dx.doi.org/10.1109/BMEI.2009.5305453 conf/bmei/2009 db/conf/bmei/bmei2009.html#HuangZXW09