Dr. Yi-Fang Chang. “Multiply Connected Topological Economics, Nonlinear Theory of Economic Growth and Its Three Laws, and Four Theorems on Knowledge Economic Theory”. Global Journal of Science Frontier Research 12, no. F13 (December 15, 2012): 1–13. Accessed April 27, 2024. https://journalofscience.org/index.php/GJSFR/article/view/678.