@article{1255455259, author = {Lehmer, D. H.}, title = {On the exact number of primes less than a given limit}, journal = {Illinois J. Math.}, volume = {3}, number = {1}, year = {1959}, pages = { 381-388}, language = {en}, url = {http://dml.mathdoc.fr/item/1255455259} }
Lehmer, D. H. On the exact number of primes less than a given limit. Illinois J. Math., Tome 3 (1959) no. 1, pp. 381-388. http://gdmltest.u-ga.fr/item/1255455259/