Koichi Goto Yahiko Kambayashi Study on Mobile Passenger Support Systems for Public Transportation Using Multi-channel Data Dissemination. 317-330 2001 conf/digitalCities/2001 Digital Cities http://link.springer.de/link/service/series/0558/bibs/2362/23620317.htm db/conf/digitalCities/digitalCities2001.html#GotoK01