References
- Good , I. J. 1975 . The number of orderings of n candidates when ties are permitted . Fibonacci , 13 : 11 – 18 .
- Gross , O. A. 1962 . Preferential arrangements . Amer. Math. Monthly , 69 : 4 – 8 .
- Sloan , N. J. A. 1973 . “ A Handbook of Integer Sequences ” . New York and London : Academic press .