A bibliography of ray tracing related references is available at this site. The bibliographic references are in refer format. You can obtain it as a ZIP file or just the ray.refer file itself as text. Please report any missing references or errors to Eric Haines.
You can search this bibliography online.
A somewhat dated (last updated in 1993) but still useful resource from Tom Wilson is his set of ray tracing abstracts, giving not only article references but also the abstracts. You can download the ZIP file of all of abstracts or the individual Latex files of abstracts, newer abstracts, or his read me file.
Last change: September 2, 1999