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Transactions of the Royal Society of Tropical Medicine and Hygiene > 1997 > 91 > 4 > 468-472
Applied Mathematics Letters > 1997 > 10 > 1 > 123-127
European Journal of Cancer > 1995 > 31 > 13-14 > 2185-2190
Transactions of the Royal Society of Tropical Medicine and Hygiene > 1995 > 89 > 6 > 654-656