Yunjie Zhang | 张平文 https://www.math.pku.edu.cn/pzhang/zh/authors/yunjie-zhang/ Yunjie Zhang Wowchemy (https://wowchemy.com)zh-HansSat, 01 Jan 2022 00:00:00 +0000 https://www.math.pku.edu.cn/pzhang/images/icon_hua2ec155b4296a9c9791d015323e16eb5_11927_512x512_fill_lanczos_center_3.png Yunjie Zhang https://www.math.pku.edu.cn/pzhang/zh/authors/yunjie-zhang/ The comparative study on the digital economy and trade between China, the U.S. and the EU https://www.math.pku.edu.cn/pzhang/zh/publication/2022_csdetbcue/ Sat, 01 Jan 2022 00:00:00 +0000 https://www.math.pku.edu.cn/pzhang/zh/publication/2022_csdetbcue/