@article{10_4153_CMB_1975_075_x,
     author = {Tymchatyn, E. D.},
     title = {Partial {Orders} on the {2-Cell}},
     journal = {Canadian mathematical bulletin},
     pages = {411--416},
     year = {1975},
     volume = {18},
     number = {3},
     doi = {10.4153/CMB-1975-075-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-075-x/}
}