引用未定义，包含某些作者姓名

Question

我在 Overleaf 上使用 ACM 模板，我发现在作者字段中使用某些名称意味着 .tex 文件无法找到引用。

例如，这有效......

@Book{background7,
author={John},
year = {2010},
title = {The Design of Approximation Algorithms},
publisher = {Cambridge University Press},
}

但这不管用

@Book{background7,
author={Perell},
year = {2010},
title = {The Design of Approximation Algorithms},
publisher = {Cambridge University Press},
}

错误：Package natbib Warning: Citation `background7' on page 1 undefined on input line 57.

\documentclass[nonacm, screen,review=true, natbib=true]{acmart}

\bibliographystyle{ACM-Reference-Format}
\bibliography{references}