共 7 条
[3]
高级计量经济学及Stata应用[M]. 高等教育出版社 , 陈强, 2014
[5]
Environmental policy stringency and technological innovation: evidence from survey data and patent counts[J] . Nick Johnstone,Ivan Ha??i?,Julie Poirier,Marion Hemar,Christian Michel.Applied Economics . 2012 (17)
[6]
On the relationship between environmental management, environmental innovation and patenting: Evidence from German manufacturing firms[J] . Marcus Wagner.Research Policy . 2007 (10)