@inproceedings{nw-mipdh-06,
 author = {Nöllenburg, Martin and Wolff, Alexander},
 booktitle = {Graph Drawing (GD'05)},
 doi = {10.1007/11618058_29},
 editor = {Healy, Patrick and Nikolov, Nikola S.},
 pages = {321--333},
 publisher = {Springer Berlin Heidelberg},
 series = {LNCS},
 title = {A Mixed-Integer Program for Drawing High-Quality Metro Maps},
 volume = {3843},
 year = {2006}
}