1. The World Health Report 1998;Ginebra,1998
2. Historia de la tuberculosis como epidemia global;Bates;Clin Med North Am,1993
3. Impact of migration associated T.B;Antunes;Tuberc Lung Dis,1996
4. Tuberculosis programme, WHO, Geneva, Switzerland;Raviglione;Bull World Health Org,1993
5. The epidemiology of tuberculosis in the United States;McGray;Clin Chest Med,1997