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== Tham khảo ==
{{tham khảo}}
* {{Chú thích sách|url=https://archive.org/details/introductiontoab0000hall_v1|title=An Introduction to Abstract Algebra|last=Hall|first=F. M.|publisher=Cambridge University Press|year=1969|isbn=0521084849|volume=2|chapter=Section 3.6|url-access=registration}}
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