Date
John Tresch of UPenn introduced Michael Friedman's "Carnap, Cassirer, and Heidegger: The Davos Disputation and Twentieth Century Philosophy." European Journal of Philosophy. Vol 10, issue 3, pages 263-274, December 2002 and Peter Gordon's Continental Divide: Heidegger, Cassirer, Davos (Harvard, 2010), Chapter 1: 43-86.