Katherine Stephanie Benedicta Keats-Rohan, an Oxford history researcher, has written a brief biography of Alan for the Oxford Dictionary of National Biography. This article is available here:
A most interesting source of scholarly information about Alan and his times in England and neighbouring countries is:
Domesday People: A Prosopography of Persons Occurring in English Documents 1066-1166, Volume I: Domesday Book, by K.S.B. Keats-Rohan; published January 21, 1999; ISBN-10: 085115722X; ISBN-13: 978-0851157221.
Volume II of that work concerns Domesday Descendants. In 2011 Keats-Rohan followed up Volume I with an article that can be viewed online or downloaded as a PDF (if you have a Facebook account) from Academia dot Edu:
Primary sources for Alan's activities include charters of England and Brittany, and of course the Domesday Book, which is available online in various forms, of which my favourite is at:
The Wikipedia article is quite instructive, even though it contains some interpolation and interpretation of Alan's life by Yours Truly:
Many comments of mine about this remarkable fellow are found in these blogs:
I intend to add further information about Count Alan Rufus to this blog. So stay tuned.