@article{1255631807,
author = {Rosser, J. Barkley and Schoenfeld, Lowell},
title = {Approximate formulas for some functions of prime numbers},
journal = {Illinois J. Math.},
volume = {6},
number = {1},
year = {1962},
pages = { 64-94},
language = {en},
url = {http://dml.mathdoc.fr/item/1255631807}
}
Rosser, J. Barkley; Schoenfeld, Lowell. Approximate formulas for some functions of prime numbers. Illinois J. Math., Tome 6 (1962) no. 1, pp. 64-94. http://gdmltest.u-ga.fr/item/1255631807/