1. Pathogenesis of pneumococcal pneumonia;Johnston;Rev Infect Dis,1991
2. Integrated management of childhood illness by outpatient health workers: technical basis and overview;Gove;Bull WHO,1997
3. World Development Report 1993 1993 Washington: The World Bank
4. The pneumococcal problem;Obaro;BMJ,1996
5. Pneumococcal vaccine;Fedson,1998