Lazaros Gymnopoulos Stelios Dritsas Stefanos Gritzalis Costas Lambrinoudakis 100-111 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2776&spage=100 2003 conf/mmmacns/2003 MMM-ACNS db/conf/mmmacns/mmmacns2003.html#GymnopoulosDGL03