@article{CMJ_1999_49_4_a16,
     author = {Merryfield, Kent and Stein, James D., Jr.},
     title = {Common fixed points of two isotone maps on a complete lattice},
     journal = {Czechoslovak Mathematical Journal},
     pages = {849--866},
     year = {1999},
     volume = {49},
     number = {4},
     mrnumber = {1746711},
     zbl = {1005.06003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1999_49_4_a16/}
}