TY  - JOUR
TI  - Rankings and Ranking Functions
JO  - Canadian journal of mathematics
PY  - 1981
SP  - 395
EP  - 399
VL  - 33
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-033-0/
DO  - 10.4153/CJM-1981-033-0
ID  - 10_4153_CJM_1981_033_0
ER  -