I have made the latest version of the ray tracing bibliography which Paul
Heckbert and I compiled (with help from many others) available at:
Let me know of any errors or missing references. I've tried to limit new
entries to those directly dealing with ray tracing itself as a rendering
algorithm or that talk about monte carlo sampling or volume visualization using
ray tracing (as opposed to references which mention ray tracing simply as
another tool, which for the most part it has become).