Fine-grained permutation entropy as a measure of natural complexity for time series
刘小峰, 王越
Fine-grained permutation entropy as a measure of natural complexity for time series
Liu Xiao-Feng(刘小峰) and Wang Yue(王越)
中国物理B . 2009, (7): 2690 -2695 .  DOI: 10.1088/1674-1056/18/7/011