%0 Journal Article %A Ky Fan %T Topological Proofs for Certain Theorems on Matrices with Non-Negative Elements. %J Monatshefte für Mathematik %D 1958 %P 219-237 %V 62 %I mathdoc %U http://geodesic.mathdoc.fr/item/MOMA_1958__62_177042/ %F MOMA_1958__62_177042