Annalisa Bossi Nicoletta Cocco Sandro Etalle Sabina Rossi Declarative Semantics of Input Consuming Logic Programs. 90-114 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3049&spage=90 2004 conf/lopstr/2004lncs Program Development in Computational Logic db/conf/lopstr/lncs3049.html#BossiCER04