1. Bailar, J.C. and Ederer, F. (1964)Significance factors for the ratio of a Poisson variable to its expectation. - Biometrics, 20: 639?643.
2. Barbujani, G. and Calzolari, E, (1984): Comparison of two statistical techniques for the surveillance of birth defects through a Montecarlo simulation.- Stat. Med. 3: 239?247.
3. Barbujani, G. and Calzolari, E. (1985): Performance of three techniques for the surveillance of congenital malformations. A computer simulation test. In De Wals, P., Weatherall, J.A.C., Lechat, F., editors: Registration of congenital anomalies in EUROCAT centres 1979?1983. - pp. 225?232, Cabay, Louvain-la-neuve.
4. Barbujani, G., Calzolari, E. (1985): Author's reply. Comparison of two statistical techniques for the surveillance of birth defects through a Montecarlo simulation. - Stat. Med. 4: 390?391.
5. Chen, R. (1978): A surveillance system for congenital malformations. - J. Amer. Stat. Ass. 73: 323?327.