TY  - JOUR 
T1  - AN EVOLUTIONARY STUDY ON CROP PRODUCTION IN SMALL FARM SYSTEMS IN THE MID-WEST REGION OF BRAZIL BASED ON A LINEAR PROGRAMMING MODEL
JO  - Pesquisa Operacional
A1  - Biagio, Maria Amelia
SN  - 0101-7438
UL  - 10.1590/0101-7438.2014.034.02.0251
VL  - 34 
Y1  - 2014
PB  - Brasil 
ER  -