@article{10_4153_CJM_1969_057_7,
     author = {Gray, William J.},
     title = {A {Fixed-Point} {Theorem} for {Commuting} {Monotone} {Functions}},
     journal = {Canadian journal of mathematics},
     pages = {502--504},
     year = {1969},
     volume = {21},
     number = {1},
     doi = {10.4153/CJM-1969-057-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-057-7/}
}