Abstract
Almost all positive integers may be represented as the sum of four cubes of positive square-free integers.
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Baker, R.C., Brüdern, J. Sums of cubes of square-free numbers. Monatshefte für Mathematik 111, 1–21 (1991). https://doi.org/10.1007/BF01299273
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DOI: https://doi.org/10.1007/BF01299273