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- ↑ 1.0 1.1 1.2 1.3 1.4 Taagepera, Rein (1979). "Size and Duration of Empires: Growth–Decline Curves, 600 BC to 600 AD". Social Science History. Social Science History, Vol. 3, No. 3/4. 3 (3/4): 115–138 [125]. doi:10.2307/1170959. JSTOR 1170959.