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Evaluation of the convolution sum $$\displaystyle \varvec{\sum _{al+bm=n} \sigma (l)\sigma _ 3 (m) }$$ for $$\varvec{(a,b) = (1,7), (7,1), (1,8), (8,1), (1,9), (9,1)}$$ and representations by certain quadratic forms in twelve variables

Crossref DOI link: https://doi.org/10.1007/s13226-023-00459-2

Published Online: 2023-07-12

Published Print: 2025-03

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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