@article{10_4064_aa_52_4_307_337,
     author = {N. Costa Pereira},
     title = {Elementary estimates for the {Chebyshev} function },
     journal = {Acta Arithmetica},
     pages = {307--337},
     publisher = {mathdoc},
     volume = {52},
     number = {4},
     year = {1989},
     doi = {10.4064/aa-52-4-307-337},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-52-4-307-337/}
}