The fact that Shem-Tob’s Matthew does not equal du Tillet’s was proven in 1929 by Alexander Marx, “The Polemical Manuscripts in the Library of the Jewish Theological Seminary of America” in Studies in Jewish Bibliography and Related Subjects in Memory of Abraham Solomon Freidus (1867–1923), no ed. (New York: The Alexander Kohut Memorial Foundation, 1929), pp. 270–273. Unfortunately, few apparently read Marx’s article. Also cf. Lapide, Hebrew in the Church, transl. Erroll F. Rhodes (Grand Rapids, MI: Eerdmans, 1984), p. 55: “And yet with even the most superficial comparison of the two works the radical differences between their vocabulary, style, and diction would have demonstrated the impossibility of a common origin.”