Ping Xuan Subhabrata Sen Oscar González Jesus Fernandez Krithi Ramamritham Broadcast on Demand: Efficient and Timely Dissemination of Data in Mobile Environments. 38-48 1997 conf/rtas/1997 IEEE Real Time Technology and Applications Symposium http://computer.org/proceedings/rtas/8016/80160038abs.htm db/conf/rtas/rtas1997.html#XuanSGFR97