共 41 条
[1]
[Anonymous], 2009, CHIN STAT YB 2009
[2]
[Anonymous], 2013, Regression Analysis of Count Data
[3]
[Anonymous], 2010, UN C TRAD DEV NEW YO
[4]
[Anonymous], 2000, TECHNOLOGY LEARNING
[7]
Cameron A.Colin., 2009, Microeconomics Using Stata
[8]
Darby M. R., 2003, NBER WORKING PAPER S