1. The Confluent Hypergeometric Function;Buchholz,1969
2. Point a Processes;Cox,1980
3. Erdélyi, A., Magnus, W., Oberhettinger, F., Tricomi, G.F., 1953. Higher Transcendental Functions, vol. 2, McGraw-Hill, New York.
4. On an extension of the connexion between Poisson and χ2 distributions;Johnson;Biometrika,1959
5. Univariate Discrete Distributions;Johnson,1992