"In this paper, we consider crossovers of demographic density distributions from...populations that have the same fertility and mortality rates. We focus on observed populations and their associated stationary and stable models, and on proportional distributions of persons, births, deaths and reproductive values.... Three different populations were selected to represent a range of demographic behavior. Those populations are Japan 1963, a low mortality, low fertility population; Togo 1961, a high mortality, high fertility population; and the United States 1919-1921, a population whose fertility and mortality are intermediate."

中文翻译：

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将具有相同生命率的人群联系起来的交叉*

“在本文中，我们考虑了人口密度分布的交叉点……具有相同生育率和死亡率的人口。我们关注观察到的人口及其相关的平稳和稳定模型，以及人口、出生、死亡和生殖价值……选择了三个不同的人口来代表一系列人口行为。这些人口是日本 1963 年，低死亡率、低生育率人口；多哥 1961 年，死亡率高，生育率高；和美国 1919- 1921 年，人口的生育率和死亡率处于中等水平。”