Marek A. Bednarczyk Limits of Modularity. 167-187 2006 74 Fundam. Inform. 2-3 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=74&issue=2&spage=167 db/journals/fuin/fuin74.html#Bednarczyk06