Shao, Chenxi, Lizhong Wang, Lipeng Xiao, and Jinliang Wu. “Qualitative Phase Space Reconstruction Analysis of Supply-Chain Inventor Time Series”. South African Journal of Science 106, no. 11/12 (November 19, 2010): 7 pages. Accessed May 5, 2024. https://sajs.co.za/article/view/10097.