Vaclav Cechticky Alessandro Pasetti O. Rohlik Walter Schaufelberger 101-114 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3107&spage=101 2004 conf/icsr/2004 ICSR db/conf/icsr/icsr2004.html#CechtickyPRS04