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[John Maynard Keynes], Some Economic Consequences of a Declining Population, Population and Development Review, Vol. 4, No. 3 (Sep., 1978), pp. 517-523 ...
A. B. Kempe, On the Geographical Problem of the Four Colours, American Journal of Mathematics, Vol. 2, No. 3 (Sep., 1879), pp. 193-200 ...
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