TY  - JOUR
AU  - N. Costa Pereira
TI  - Elementary estimates for the Chebyshev function 
JO  - Acta Arithmetica
PY  - 1989
SP  - 307
EP  - 337
VL  - 52
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/aa-52-4-307-337/
DO  - 10.4064/aa-52-4-307-337
LA  - en
ID  - 10_4064_aa_52_4_307_337
ER  -