MathSciNet bibliographic data MR457374 (56 #15581b) 10H05 Schoenfeld, Lowell Sharper bounds for the Chebyshev functions $\theta (x)$$\theta (x)$ and $\psi (x)$$\psi (x)$. II. Math. Comp. 30 (1976), no. 134, 337–360. Article

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