@article {IOPORT.50030522,
    author       = {Keller, Andr\'e A.},
    title        = {Graph theory and economic models: from small to large size applications},
    year         = {2007},
    journal      = {Electronic Notes in Discrete Mathematics},
    volume       = {28},
    pages        = {469-476},
    doi          = {10.1016/j.endm.2007.01.065},
    identifier   = {50030522},
}