Luzi Anderegg Paolo Penna Peter Widmayer Online Train Disposition: To Wait or Not to Wait? 387-398 2009 Robust and Online Large-Scale Optimization http://dx.doi.org/10.1007/978-3-642-05465-5_17 series/lncs/5868 db/series/lncs/lncs5868.html#AndereggPW09