Did the Early Middle Ages Really Exist?
Dr. Hans-Ulrich Niemitz

There was a realy good documentary on bbc on the same topic and with the same result.

<A href='http://www.cl.cam.ac.uk/~mgk25/volatile/Niemitz-1997.pdf'>http://www.cl.cam.ac.uk/~mgk25/volatile/Niemitz-1997.pdf</a> .