Alvin Yew Audun Strand Antonio Liotta George Pavlou Aggregation of Composite Location-Aware Services for Mobile Cellular Networks. 260-272 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2867&spage=260 2003 conf/dsom/2003 DSOM db/conf/dsom/dsom2003.html#YewSLP03