Liao, Chang-Sheng, and Xinyan Li. “The Impact of R&D Efficiency on Economic Growth in China: Non-Linear Threshold Effects”. Technological and Economic Development of Economy 30, no. 5 (July 9, 2024): 1205–1228. Accessed December 2, 2024. https://aviation.vgtu.lt/index.php/TEDE/article/view/20166.