 More recently, Fritz Zimmerman has argued that Stern’s hypothesis of an otherwise unattested “Neoplatonist” as source for Israeli is superfluous. Israeli’s source may have been the Longer Theology of Aristotle, while Ibn Hasday’s source may simply have been Israeli, either synthesizing the view’s in Israeli’s extant treatises, or paraphrasing a lost treatise of Israeli’s. In the absence of further documentary evidence, neither Stern’s nor Zimmerman’s theory can be definitively ruled out.