Booth, Capanu and Heigenhauser (2005), "Exact conditional p-value calculation for the quasi-symmetry model", Journal of Computational and Graphical Statistics 14(3):716-725
Booth and Butler (1999), "An importance sampling algorithm for exact conditional tests in log-linear models", Biometrika 86:321-332
Caffo and Booth (2001), "A Markov chain Monte Carlo algorithm for approximating exact conditional tests", Journal of Computational and Graphical Statistics 10:730-745