@misc{BeckenbachBorndoerfer, author = {Beckenbach, Isabel and Bornd{\"o}rfer, Ralf}, title = {A Hall Condition for Normal Hypergraphs}, issn = {1438-0064}, doi = {10.1016/j.disc.2018.06.013}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-56175}, abstract = {Conforti, Cornu{\´e}jols, Kapoor, and Vusković gave a Hall-type condition for the non-existence of a perfect matching in a balanced hypergraph. We generalize this result to the class of normal hypergraphs.}, language = {en} } @misc{BeckenbachBorndoerferKnobenetal., author = {Beckenbach, Isabel and Bornd{\"o}rfer, Ralf and Knoben, Loes and Kretz, David and Uetz, Marc}, title = {The S-Bahn Challenge in Berlin}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-53792}, abstract = {The S-Bahn Challenge in Berlin is a challenge in which one has to travel the entire S-Bahn network of Berlin in the shortest possible time. We explain how the problem can be modeled and solved mathematically. Furthermore, we report on our record attempt on January 10, 2015.}, language = {en} } @article{BeckenbachBorndoerferKnobenetal., author = {Beckenbach, Isabel and Bornd{\"o}rfer, Ralf and Knoben, Loes and Kretz, David and Uetz, Marc J.}, title = {The S-Bahn Challenge in Berlin}, series = {OR News}, journal = {OR News}, number = {53}, pages = {10 -- 14}, language = {en} }