Helmar Burkhart Rudolf Eigenmann Tomàs Margalef Thomas Ludwig 0002 5-6 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2790&spage=5 2003 conf/europar/2003 Euro-Par db/conf/europar/europar2003.html#BurkhartEML03