Wang, Zhiyu, Jingyu Wu, Guang Yu, and Zhiping Song. “Text Analysis and Visualization Research on the Hetu Dangse During the Qing Dynasty of China”. Information Technology and Libraries 40, no. 3 (September 20, 2021). Accessed April 17, 2024. https://ital.corejournals.org/index.php/ital/article/view/13279.