Have made a start to show willing There are many more references but mostly in the academic literature inaccessible to general users of the www I ll use these where needed but will try and find some references that can be accessed freely as well I have to declare a potential COI here I am a practitioner of CAT so I have a vested interest in the article However I guess it also means I have ready access to the sources needed so maybe I m not in a bad position to do this as long as others can check the neutrality of what I contribute Talk