By Park Jungsoo   Ryu Hang   in Journal of Productivity Analysis

ISSN:0895-562X|25|3|243-255

Springer Publishing Company ‎(2006)‎

Access to resources Favorite 13.683674

By Ryu Hang Keun   in Applied Economics Letters

ISSN:1466-4291|10|13|863-866

Routledge Ltd‎(2003)‎

Access to resources Favorite 13.683674