%0 Journal Article %A Gray, William J. %T A Fixed-Point Theorem for Commuting Monotone Functions %J Canadian journal of mathematics %D 1969 %P 502-504 %V 21 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-057-7/ %R 10.4153/CJM-1969-057-7 %F 10_4153_CJM_1969_057_7