@misc{10_4153_CJM_1981_033_0,
     title = {Rankings and {Ranking} {Functions}},
     journal = {Canadian journal of mathematics},
     pages = {395--399},
     year = {1981},
     volume = {33},
     number = {2},
     doi = {10.4153/CJM-1981-033-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-033-0/}
}