16. Hermann Danuser, in his essay on Opus 90 in the collection, Beethoven: Interpretationen seiner Werke, ed. Albrecht Riethmüller, Carl Dahlhaus and Alexander L. Ringer (Laaber: Laaber-Verlag, 1994), II: 26, comprehends the problem under the rubric “Kontrastsukzession und syntaktische Ambiguität.”