1. A Course in Enumeration;Aigner,2007
2. Near subgroups of finite groups;Aschbacher;J. Group Theory,1998
3. Riordan pseudo-involutions, continued fractions and Somos-4 sequences;Barry;J. Integer Seq.,2019
4. Riordan Arrays: A Primer;Barry,2016
5. A Walk Through Combinatorics, An Introduction to Enumeration and Graph Theory;Bóna,2002