TY  - JOUR 
T1  - PRECONDITIONING ISSUES IN THE NUMERICAL SOLUTION OF NONLINEAR EQUATIONS
               AND NONLINEAR LEAST SQUARES
JO  - Pesquisa Operacional
A1  - Bellavia, Stefania
A1  - Porcelli, Margherita
SN  - 0101-7438
UL  - 10.1590/0101-7438.2014.034.03.0421
VL  - 34 
Y1  - 2014
PB  - Brasil 
ER  -