There are two papers by Morwen Thistlethwaite on this subject, both dating
I got these copies from David Singmaster after having tried unsuccessfully
to get them from Morwen himself.
I have since then made many copies of these notes for many people all around
I will continue to do this as long as I feel comfortable about it.
So if there is still anybody out there who wants them, please e-mail me
directly at email@example.com or at firstname.lastname@example.org