Ljupco Todorovski Peter Ljubic Saso Dzeroski Inducing Polynomial Equations for Regression. 441-452 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3201&spage=441 2004 conf/ecml/2004 ECML db/conf/ecml/ecml2004.html#TodorovskiLD04