@article{oai:niigata-u.repo.nii.ac.jp:00027280,
 author = {Koyama, Yoji},
 journal = {新潟大学経済論集, 新潟大学経済論集},
 month = {Sep},
 pages = {55--72},
 title = {EU's Southeastward Enlargement and Challenges for the West Balkans},
 volume = {83},
 year = {2007}
}