Ray Tracing Bezier Surfaces

I am studying ray tracing of Bezier surfaces and am interested to know what the state of the art is in this area. Toth(1985) wrote a benchmark paper on this subject, and I am especially interested to know how the state of the art compares to Toth’s work in speed and reliability.
I would appreciate knowing any references that I might consult to get information on this.
Thanks in advance for any help you can give.