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J. SINGH,
A. K. HARIT,
D. C. JAIN,
R. C. PANDA,
K. N. TEWARI,
R. BHATIA
and J. SOKHEY
(1999).
Diphtheria is declining but continues to kill many children: analysis of data from a sentinel centre in Delhi, 1997. Epidemiology and Infection,
123
,
pp 209-215
doi:10.1017/S0950268899002812