Only scraps... David Irving I think is the guy that writes all about it.. just look up Revisionist Historian in a search engine, and it will come up with heaps.
Pretty much, all they do is refute what historians have taken to be facts. They don't so much deny it, as much as the revise the traditional view on the Holocaust.
They put the death toll at 1 million, saying that 6 million is an unrealistic number, thats largely symbolic.
They claim gas chambers didn't exist.
They say that the holocaust needs to be looked on in comparrison to everything else that was going on in the time period (Chinese holocaust, the Gulag in Russia, the carpet bombing of Germany, the atomic bomb being droped on Japan, and the general treatment of POW's -- on all sides -- the Soviets, Axis Powers and the Allies.) and when you compare, you see that many worse things happened.
I don't agree with them, I think Irving is a wanker, and haven't read much of their work. But the scraps I have, some historians that revise the holocaust do bring up legitimate questions (the numbers, for instance. There was good supporting evidence of that, just can't remember what it was)
Anyway, like I said, just do a quick search first, and you'll get a few historians you could start looking at. (Both Revisonist and the ones who hate the Revisionists) Or just look for a David Irving book, he's written the most on this.
It sounds really inetresting though, good luck!