Ilan Adler, Alan J. Hoffman, et al.
Discrete Applied Mathematics
We discuss three equivalent formulations of a theorem of Seymour on nonnegative sums of circuits of a graph, and present a different (but not shorter) proof of Seymour's resut. © 1986 Springer-Verlag New York Inc.
Ilan Adler, Alan J. Hoffman, et al.
Discrete Applied Mathematics
Alan J. Hoffman, Arthur F. Veinott Jr.
Mathematical Programming
Heinz Gröflin, Alan J. Hoffman
Combinatorica
Louis J. Billera, Carl W. Lee
European Journal of Combinatorics