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@article{AM2_1976__14_136585, author = {R.N., Haff, C.E. Burns}, title = {A combinatorial ranking problem. {(Short} {Communication).}}, journal = {Aequationes mathematicae}, pages = {245--246}, publisher = {mathdoc}, volume = {14}, year = {1976}, zbl = {0327.05122}, url = {http://geodesic.mathdoc.fr/item/AM2_1976__14_136585/} }
R.N., Haff, C.E. Burns. A combinatorial ranking problem. (Short Communication).. Aequationes mathematicae, Tome 14 (1976), pp. 245-246. http://geodesic.mathdoc.fr/item/AM2_1976__14_136585/