Author Title Journal ISSN Publisher Date Volume Number Page URL URL(DOI) 小林 和博,久保 幹雄,加納 敏幸 A Two-phase approach for a tramper ship scheduling problem(Summaries of Papers Published by Staff of National Maritime Research Institute at Outside Organizations) Papers of National Maritime Research Institute 13465066 National Maritime Research Institute 2008-10-10 8 2 228 http://ci.nii.ac.jp/naid/110007661597/en/