Francesco Calimeri Giovambattista Ianni Giuseppe Ielpa Adriana Pietramala Maria Carmela Santoro A System with Template Answer Set Programs. 693-697 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3229&spage=693 2004 conf/jelia/2004 JELIA db/conf/jelia/jelia2004.html#CalimeriIIPS04