TY  - JOUR 
T1  - A Levenberg-Marquardt algorithm for fi tting σ-w curves from three-point bend tests for plain and fi ber reinforced concretes
JO  - Revista IBRACON de Estruturas e Materiais
A1  - Sousa, J.L.A.O.
SN  - 1983-4195
UL  - 10.1590/S1983-41952011000400010
VL  - 4 
Y1  - 2011
PB  - Brasil 
ER  -