@article{oai:kanazawa-u.repo.nii.ac.jp:00007702,
 author = {Matsubayashi, Akira},
 issue = {5},
 journal = {IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences},
 month = {May},
 pages = {1218--1226},
 title = {On the Complexity of Minimum Congestion Embedding of Acyclic Graphs into Ladders},
 volume = {E84-A},
 year = {2001}
}