Lying about Hitler by 
Denying History by 
Holocaust Denial by 
Denying the Holocaust by 
From Empathy to Denial by 
Holocaust Denial by JSTOR, Project Muse, EBSCO's Academic Search Complete, Wiley Online Library and Sage Journals Online all have articles about Holocaust denial. Here are a few interesting ones.
Lang, B. (2010). "Six Questions on (or About) Holocaust Denial," History and Theory, 49.2, 157-168.
Drobnicki, J.A. (2009/2010). "Holocaust-Denial Literature: a Sixth Bibliography," Journal of Hate Studies, 8.1, 103-129.
Wright, J. (2006). "Argument in Holocaust Denial: the Differences Between Historical Casuistry and Denial Casuistry," Argumentation & Advocacy, 43.2, 51-64.
Michael, G. (2007). "Mahmoud Ahmadinejad's Sponsorship of Holocaust Denial," Totalitarian Movements & Political Religions, 8.3/4, 667-671.