 One of the chief novelties of Dempster-Shafer theory is its modeling of belief update, which we do not cover here. For a good introduction to this and other aspects of Dempster-Shafer theory, see Section 5.4 in Kyburg and Teng (2001). For a Dutch Book-style argument for Dempster-Shafer theory, see Paris (2001). For an accuracy-style argument see Williams (2012).