@article{DCG_1986__1_130992,
     author = {A.J. Hoffman and Carl W. Lee},
     title = {On the {Cone} of {Nonnegative} {Circuits.}},
     journal = {Discrete & computational geometry},
     pages = {229--240},
     publisher = {mathdoc},
     volume = {1},
     year = {1986},
     zbl = {0599.05039},
     url = {http://geodesic.mathdoc.fr/item/DCG_1986__1_130992/}
}