MathSciNet bibliographic data MR457373 (56 #15581a) 10H05 Rosser, J. Barkley; Schoenfeld, Lowell Sharper bounds for the Chebyshev functions $\theta (x)$$\theta (x)$ and $\psi (x)$$\psi (x)$. Collection of articles dedicated to Derrick Henry Lehmer on the occasion of his seventieth birthday. Math. Comp. 29 (1975), 243–269. Article

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