チェビシェフ関数
↑ Hardy, G.H.; Wright, E.M. (2008) [1938], An Introduction to the Theory of Numbers, Revised by D.R. Heath-Brown and J.H. Silverman. Foreword by Andrew Wiles. (6th ed.), Oxford: Oxford University Press, ISBN 978-0-19-921986-5, Zbl 1159.11001
^ Pierre Dusart, "Estimates of some functions over primes without R.H.". arXiv:1002.0442
^ Pierre Dusart, "Sharper bounds for ψ, θ, π, pk", Rapport de recherche n° 1998-06, Université de Limoges.