An Improved Saddlepoint Approximation Based on the Negative Binomial Distribution for the General Birth Process. - Gordon K. Smyth; Heather M. Podlich (Comput. Stat., 2002)

Semi-parametric extended Poisson process models for count data. - Heather M. Podlich; Malcolm J. Faddy; Gordon K. Smyth (Stat. Comput., 2004)