1. Famine and the Future of Food Security in North Korea. Policy Brief No. 11;Ahn,2005
2. Guide to Maritime Informatics;Artikis,2021
3. Maritime Networks, Port Efficiency, and Hinterland Connectivity in the Mediterranean;Arvis,2019
4. China says enforcing North Korea coal ban seriously, no violation;Blanchard,2017
5. An Overview of North Korea-Japan Relations;Blomquist,2015