We have been looking for this document on the Web. We think we have found the following, freely available version(s) of it: http://www.ncst.ernet.in/kbcs2002/downloads/ligozat_slides.pdfFor further information about this item go to:http://iospress.metapress.com/openurl.asp?genre=article&issn=0921-7126&volume=17&issue=4&spage=183