Zacharias P Thundy (2000)
The dragon in Beowulf: Cain's Seed, heresy, and Islam.
In: Essays on Old, Middle, Modern English and Old Icelandic. In Honor of Raymond P. Tripp, Jr., ed. by Ed. Loren C. GRUBER. Edwin Mellen Press., Lewiston, vol. 60, vols. 1-2, pp. 201-230.
The article interprets religious images to argue that both Grendel and the dragon have Islamic associations, and detects literary parallels between Muḥammad's enlightenment and that of Cædmon's poetic inspiration.