1. Note on Mr. Muir's solution of a problem of arrangement;Cayley;Proc. Royal Soc. Edinburgh,1878
2. Two theorems on rational power series;Gessel;Utilitas Math.,1981
3. Combinatorial Theory;Hall,1967
4. The probleme des menages;Kaplansky;Scripta Math.,1946
5. Permanents of cyclic (0,1) matrices;Metropolis;J. Combin. Theory,1969