A finite group whose irreducible complex characters are rational-valued is called a rational group. The aim of this paper is to determine the rational almost simple and rational quasi-simple groups.

中文翻译：

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RATIONAL 近乎简单群

不可约复数为有理值的有限群称为有理群。本文的目的是确定有理的几乎单群和有理的准单群。