1. Combinatorics of Finite Sets;Anderson,1987
2. A Second Memoir upon Quantics;Cayley,1889
3. On the set of divisors of a number;de Bruijn;Nieuw Arch. Wisk.,1951
4. An Introduction to the Algebra of Quantics;Elliott,1913
5. Subspaces, subsets, and partitions;Knuth;J. Combin. Theory Ser. A,1971