Jelena Sanko Jaan Penjam Program Construction in the Context of Evolutionary Computation. 50-57 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2890&spage=50 2003 conf/ershov/2003 Ershov Memorial Conference db/conf/ershov/ershov2003.html#SankoP03