Liefner, Ingo, and Gang Zeng. “Cooperation Patterns of High-Tech Companies in Shanghai and Beijing: Accessing External Knowledge Sources for Innovation Processes”. ERDKUNDE 62, no. 3 (September 30, 2008): 245–258. Accessed December 4, 2024. https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/2614.