MathSciNet bibliographic data MR2321376 11A25 (11E25) Alaca, Şaban; Williams, Kenneth S. Evaluation of the convolution sums $\sum\sb {l+6m=n}\sigma(l)\sigma(m)$$\sum\sb {l+6m=n}\sigma(l)\sigma(m)$ and $\sum\sb {2l+3m=n}\sigma(l)\sigma(m)$$\sum\sb {2l+3m=n}\sigma(l)\sigma(m)$. J. Number Theory 124 (2007), no. 2, 491–510. Article

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