Google Scholar turned up a hit for this 42-page paper by a gentleman named Ian Kirk, who's apparently a professor at Goldsmiths College.  According to his personal website, it was written while he was pursuing his masters' degree, but there's no publication information listed.  It discusses, among other things, the ambiguity of the ending.  Is that worth adding as a cite? - 
Also, I found a citation for the deleted dream sequence in Google book search.  It's on pages 111 and 112 of the book "Who Wrote That Movie: Screenwriting in Review: 2000-2002" by Chris C Wehner (ISBN 0595292690). -