RT Journal T1 Agglomeration and Firm Export A1 Churen Sun, Zhihao Yu, Tao Zhang PB Front. Econ. China FD 2018-03-15 YR 2018 JF Frontiers of Economics in China JO Front. Econ. China VO 13 IS 1 SP 116 DO 10.3868/s060-007-018-0009-9 K1 agglomeration;firm export LK {https://journal.hep.com.cn/fec/EN/article/article_21985.shtml}