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"Expressing (a2 + b2 + c2 + ..."
Ronald H. Hardin, Neil J. A. Sloane (1994)
- Ronald H. Hardin, Neil J. A. Sloane:
Expressing (a2 + b2 + c2 + d2)3 as a Sum of 23 Sixth Powers. J. Comb. Theory A 68(2): 481-485 (1994)
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