Editing Lagrange's four-square theorem (section)

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*{{cite journal |first1=P. |last1=Pollack |first2=E. |last2=Treviño |title=Finding the four squares in Lagrange's theorem |journal=Integers |volume=18A |year=2018 |pages=A15 |url=http://math.colgate.edu/~integers/sjs15/sjs15.pdf}}