Unfortunately, this seminal document from around 1995, which was available for many years from web site(s) belonging to Alis Technologies, no longer seemed to be on-line at any of them.
But recently it seems to have turned up again in web searches: http://alis.isoc.org/web_ml/html/fontface.en.html
Original materials © Copyright 1994 - 2006 by A.J.Flavell