Inequalities of Rayleigh quotients and bounds on the spectral radius of nonnegative symmetric matricesDon CoppersmithAlan J. Hoffmanet al.1997Linear Algebra and Its Applications
A proof of the convexity of the range of a nonatomic vector measure using linear inequalitiesAlan HoffmanUriel G. Rothblum1994Linear Algebra and Its Applications
Optimal partitions having disjoint convex and conic hullsE.R. BarnesA.J. Hoffmanet al.1992Mathematical Programming