@article{10_4153_CMB_1980_031_2,
     author = {Duffus, Dwight and Poguntke, Werner and Rival, Ivan},
     title = {Retracts and the {Fixed} {Point} {Problem} for {Finite} {Partially} {Ordered} {Sets}},
     journal = {Canadian mathematical bulletin},
     pages = {231--236},
     year = {1980},
     volume = {23},
     number = {2},
     doi = {10.4153/CMB-1980-031-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1980-031-2/}
}