추상대수학의 몇가지 개념은 알고 있으면 유용함
정수계수 2변수 이차형식
초등정수론에서 자연스럽게 등장하는 군
From Fermat to Minkowski: Lectures on the Theory of Numbers and Its Historical Development
Winfried Scharlau, Hans Opolka
A Short Proof That Every Prime $p \equiv 3 (\mathrm{mod} 8)$ Is of the Form x2 + 2y2
The Fundamental Theorem of Arithmetic Dissected
The Unique Factorization Theorem: From Euclid to Gauss
, Introduction to integral binary quadratic forms