TY  - JOUR 
T1  - An object-oriented model for complex bills of materials in process industries
JO  - Brazilian Journal of Chemical Engineering
A1  - Vegetti, M.
A1  - Henning, G.P.
A1  - Leone, H.P.
SN  - 0104-6632
UL  - 10.1590/S0104-66322002000400019
VL  - 19 
Y1  - 2002
PB  - Brasil 
ER  -