%0 Journal Article %T Rankings and Ranking Functions %J Canadian journal of mathematics %D 1981 %P 395-399 %V 33 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-033-0/ %R 10.4153/CJM-1981-033-0 %F 10_4153_CJM_1981_033_0