Sven Oliver Krumke Willem de Paepe Diana Poensgen Maarten Lipmann Alberto Marchetti-Spaccamela Leen Stougie On Minimizing the Maximum Flow Time in the Online Dial-a-Ride Problem. 258-269 2005 conf/waoa/2005 WAOA http://dx.doi.org/10.1007/11671411_20 db/conf/waoa/waoa2005.html#KrumkePPLMS05