Katre, S. A.
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MATHEMATICA SCANDINAVICA Vol. 53 (1983) - Articles
On the Jacobsthal sum $\phi_9(a)$ and the related sum $\psi_9(a)$.
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MATHEMATICA SCANDINAVICA Vol. 60 (1987) - Articles
Resolution of the sign ambiguity in the determination of the cyclotomic numbers of order 4 and the corresponding Jacobsthal sum.
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