Tian, R. G. ., X. . Shu, and Y. . Liu. “Exploring the Mechanisms of Underground Economy: A Case Study of the Informal Bicycle Market in a Southern China City”. Edelweiss Applied Science and Technology, vol. 8, no. 6, Sept. 2024, pp. 109-23, doi:10.55214/25768484.v8i5.1817.