TY  - JOUR 
T1  - Phase-shift definition for pion-nucleon scattering from chiral perturbation theory
JO  - Brazilian Journal of Physics
A1  - Cavalcante, Isabela P.
A1  - Borges, J. Sá
SN  - 0103-9733
UL  - 10.1590/S0103-97332004000200024
VL  - 34 
Y1  - 2004
PB  - Brasil 
ER  -