Juerg Kohlas & Paul-Andre Monney 
Mathematical Theory of Hints [PDF ebook] 
An Approach to the Dempster-Shafer Theory of Evidence

The subject of the book is an approach to the modeling of and the reasoning under uncertainty. It develops the Dempster-Shafer Theory as a theory of the reliability of reasoning with uncertain arguments. A particular interest of this approach is that it yields a new synthesis and integration of logic and probability theory. The reader will benefit from a new view at uncertainty modeling which extends classical probability theory.