Zahn, Theodor. Die Offenbarung des Johannes ausgelegt. Leipzig: Deichert, 1924-1926; reprint, Wuppertal: R. Brockhaus Verlag, 1986. vi + 633 pp.
This work deserves a detailed presentation. It is an erudite commentary that presents material and insights hardly found elsewhere. Zahn provides a detailed overview of the history of interpretation.