Chen, Xiaoci, Guanyu Huo, and Gaojie Cao. “ Analysis of Linkage Fluctuation in Time Series Data of Nickel Futures Price Index”. Journal of Business Economics and Management 24, no. 4 (November 8, 2023): 712–731. Accessed November 7, 2024. https://jest.vgtu.lt/index.php/JBEM/article/view/20191.