PaperOn the nonsingularity of complex matricesPaul Camion, A.J. HoffmanPacific Journal of Mathematics
PaperOn the covering of polyhedra by polyhedraA.J. HoffmanProceedings of the American Mathematical Society
PaperVariations on a theorem of RyserDasong Cao, V. Chvátal, et al.Linear Algebra and Its Applications
