Two characterizations of inverse-positive matrices: the Hawkins-Simon condition and the Le Chatelier-Braun principle. Fujimoto, Takao; Ranade, Ravindra R. — 2004 ELA. The Electronic Journal of Linear Algebra [electronic only]
Comparing solutions of equation systems involving semipositive operators Fujimoto, Takao; Herrero, Carmen; Villar, António Portugaliae mathematica