An ILP for the metro-line crossing problem.

Matthew Asquith Joachim Gudmundsson Damian Merrick An ILP for the metro-line crossing problem. 49-56 2008 CATS http://crpit.com/abstracts/CRPITV77Asquith.html conf/cats/2008 db/conf/cats/cats2008.html#AsquithGM08