共 23 条
- [1] Gravity with gravitas: A solution to the border puzzle [J]. AMERICAN ECONOMIC REVIEW, 2003, 93 (01) : 170 - 192
- [4] [Anonymous], REV EC STAT
- [5] [Anonymous], TRADE PREFERENCE ERO
- [6] [Anonymous], MEASUREMENT NONTARIF
- [7] [Anonymous], CONN COMP
- [8] [Anonymous], DOING BUS REP 2008
- [9] [Anonymous], CAGE ONLINE WORKING