"In this paper we consider the simplest and most widely used demographic feedback model, the birth-response cohort feedback model. In the case of symmetric net maternity, we put the model into a form in which one of the rare global bifurcation theorems in the mathematical literature can be brought to bear. As a consequence, we prove that the model has solutions with period exactly twice the mean age of net maternity for at least a specified range of parameter values which include cycles of non-infinitesimal amplitude." (SUMMARY IN FRE)

中文翻译：

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具有对称净母性的队列反馈模型

“在这篇论文中，我们考虑了最简单和使用最广泛的人口反馈模型，即出生反应队列反馈模型。在对称网络母性的情况下，我们将模型变成了一种形式，其中一个罕见的全局分叉定理在可以应用数学文献。因此，我们证明，对于至少指定范围的参数值（包括非无穷小幅度的周期），该模型具有周期恰好为净产妇平均年龄两倍的解决方案。” （免费摘要）