I live about 50 m from the University of Chalmers and, naturally, I make use of their library.
During my visit last week I accidently found a very interesting 6-volume set of books named Expert Systems: The Technology of Knowledge Management and Decision Making for the 21st Century.
I'm currently reading the first volume and it is very good. It's a bit theoretical, but I can really recommend it to anyone interested in Expert Systems. Here's a short list of selected chapters to whet your appetite:
Volume 1.
Ch. 4 - Reasoning with Imperfect Information.
Volume 2.
Ch. 9 - Model of Reasoning with Conflicting Information Sources in Knowledge Based Systems.
Volume 3.
Ch. 24 - Cellular Automata Architectures for Pattern Recognition.
Volume 4.
Ch. 29 - Automatic Knowledge Discovery in Larger Scale Knowledge-Data Bases.
Ch. 34 - Neural Networks for Economic Forecasting Problems.
Volume 5.
Ch. 37 - Hybrid Expert Systems: An Approach to Combining Neural Computation and Rule-Based Reasoning.
Ch. 40 - Distributed Logic Processors in Process Indentification.
Volume 6.
Ch. 46 - Methodology for Building Case-Based Resaoning Systems in Ill-Structured Optimization Domains.
There are 50 chapters all in all spanning almost 2000 pages so this is probably going to take me a while.