MathSciNet bibliographic data MR771046 (86k:11005) 11A25 (11N45 11Y35 33A70) Costa Pereira, N. Estimates for the Chebyshev function $\psi(x)-\theta (x)$$\psi(x)-\theta (x)$. Math. Comp. 44 (1985), no. 169, 211–221. Article

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