TY - CHAP A1 - Borndörfer, Ralf A1 - Liebchen, Christian ED - Kalcsics, Jörg ED - Nickel, Stefan T1 - When Periodic Timetables are Suboptimal T2 - Operations Research Proceedings 2007 Y1 - 2008 SP - 449 EP - 454 PB - SPRINGER ER - TY - CHAP A1 - Liebchen, Christian A1 - Swarat, Elmar ED - Fischetti, Matteo ED - Widmayer, Peter T1 - The Second Chvatal Closure Can Yield Better Railway Timetables T2 - ATMOS 2008 - 8th Workshop on Algorithmic Approaches for Transportation Modeling, Optimization, and Systems Y1 - 2008 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0030-drops-15802 UR - http://drops.dagstuhl.de/opus/volltexte/2008/1580 PB - Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik, Germany CY - Dagstuhl, Germany ER -