1. World Health Organization: Classification of primary immunodeficiencies. N Engl J Med 288:966?975, 1973
2. World Health Organization: Immunodeficiency. Report of a W.H.O. scientific group. Clin Immunol Immunopathol 13:296?359, 1979
3. Aiuti F, Businco L, Griscelli C, Touraine JL, Webster ADB: Improvements in methods for identifying patients with severe combined immunodeficiencies and related syndromes. Z Immunol Forsch 153:95?106, 1977
4. Aiuti F, Giunchi G,et al.: Le immunodeficienze primitive in Italia. Folia Allergol Immunol Clin 25:7?15, 1979
5. Luzi G, Bonomo R: Le immunodeficienze primitive in Italia: 1972?1981.In Le Immunodeficienze primitive in Italia, F Aiuti, M Fiorilli (eds). Rome, Field Educational Italia, 1982, pp 4?9