@article{10_4153_CJM_1967_090_0,
     author = {Forder, H. G.},
     title = {On {Order} in a {Plane}},
     journal = {Canadian journal of mathematics},
     pages = {997--1000},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-090-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-090-0/}
}