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@article{AM2_1976__14_136596, author = {R.N., Haff, C.E. Burns}, title = {A combinatorial ranking problem.}, journal = {Aequationes mathematicae}, pages = {351--356}, publisher = {mathdoc}, volume = {14}, year = {1976}, zbl = {0327.05122}, url = {http://geodesic.mathdoc.fr/item/AM2_1976__14_136596/} }
R.N., Haff, C.E. Burns. A combinatorial ranking problem.. Aequationes mathematicae, Tome 14 (1976), pp. 351-356. http://geodesic.mathdoc.fr/item/AM2_1976__14_136596/