References
- http://web.istans.or.kr
- J.-Y. Han et. al: Statistical Anlysis of Koren Welding Industry, Journal of KWS, 23-5 (2005), 222-227 (in Korea)
- American Welding Society: Welding-Related Expenditures, Investments, and Productivity Measurement in U.S. Manufacturing, Construction, and Mining Industries, 2002
- 통계청홈페이지(http://www.nso.go.kr) (in Korean)
- 무역협회(http://stat.kita.net) (in Korean)