TY  - JOUR 
T1  - Lagrangean relaxation bounds for point-feature cartographic label placement problem
JO  - Pesquisa Operacional
A1  - Ribeiro, Glaydston Mattos
A1  - Lorena, Luiz Antonio Nogueira
SN  - 0101-7438
UL  - 10.1590/S0101-74382006000300002
VL  - 26 
Y1  - 2006
PB  - Brasil 
ER  -