1. M. S. Hwang, J. H. Park, and Y. M. Kim, “Current status and development direction of the new and renewable energy industry”, Bank of Korea, 2008.
2. Grand View Research, “Green hydrogen market size, share & trends analysis report by technology”, Grand View Research, 2020. Retrieved from https://www.grandviewresearch.com/industry-analysis/green-hydrogen-market.
3. H. S. cho, and Y. H. Kim, “Gendered collaboration network in science and technology professions”, Korean Journal of Sociology, Vol. 39, No. 6, 2005, pp. 119-158, UCI : G704-000205.2005.39.6.004.
4. S. M. Lim, H. J. Yoon, and D. Bang, “Research trend analysis in 『Korean Journal of General Education』 using semantic network analysis”, Korean Journal of General Education, Vol. 14, No. 1, 2020, pp. 11-32. Retrieved from https://www.earticle.net/Article/A370529.
5. I. Y. Choi and H. S. Lee, “Network analysis of research collaborations in “Korean Corporation Management Review””, Korean Corporation Management Review, Vol. 21, No. 4, 2014, pp. 103-123. Retrieved from https://www.kci.go.kr/kciportal/ci/sereArticleSearch/ciSereArtiView.kci?sereArticleSearchBean.artiId=ART001906251.