7Robert Louis Clark, Naohiro Ogawa, Andrew Mason. Population Aging, Intergenerational Transfers and the Macroeconomy[M]. London: Edward Elgar Publishing, 2007: 307.
8Ronald Lee, Andrew Mason. Fertility, Human Capital, and Economic Growth over the Demographic Transition[J]. European Journal of Population Revue europenne de Dmographie, 2010, 26(02).
9Ronald Lee. The Outlook for Population Growth[J]. Science, 2011, 333(6042): 569-573.