PDF) Sums of four squares and Waring's Problem

The earliest appearances of the theorem was found in Alexandrian Greek mathematician Diophantus’s Arithmetica, a book written in the 3rd century AD. The book was translated in 1621 by French mathematician Bachet who stated the theorem in the notes of

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PDF] Waring-type problems for polynomials : Algebra meets Geometry

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PDF] The Waring problem for finite simple groups

Waring's Problem & Lagrange's Four-Square Theorem

Cubic Number -- from Wolfram MathWorld

Square Number -- from Wolfram MathWorld

PDF) Extended Lagrange's four-square theorem