Itsuki Noda Masayuki Ohta Yoichiro Kumada Kousuke Shinoda Hideyuki Nakashima Usability of dial-a-ride systems. 1281-1282 2005 conf/atal/2005 AAMAS http://doi.acm.org/10.1145/1082473.1082733 db/conf/atal/aamas2005.html#NodaOKSN05