Anthony Bucci Jordan B. Pollack Edwin D. de Jong Automated Extraction of Problem Structure. 501-512 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3102&spage=501 2004 conf/gecco/2004-1 GECCO (1) db/conf/gecco/gecco2004-1.html#BucciPJ04