Robuta

https://cris.biu.ac.il/en/publications/groups-of-quotients-of-semigroups-of-invertible-nonnegative-matri-2/ Groups of Quotients of Semigroups of Invertible Nonnegative Matrices over Skewfields - Bar-Ilan... nonnegative matrices bar ilan groups quotients invertible https://portal.mardi4nfdi.de/wiki/Publication:2525664 Concerning nonnegative matrices and doubly stochastic matrices - MaRDI portal nonnegative matrices doubly stochastic concerning mardi portal