1. Cameron, N.T., Nkwanta, A.: On some (pseudo) involutions in the Riordan group. J. Integer Seq. 8(3), 16 (2005)
2. Cheon, G.-S., Kim, H.: Simple proofs of open problems about the structure of involutions in the Riordan group. Linear Algebra Appl. 428, 930–940 (2008)
3. Cheon, G.-S., Kim, H., Shapiro, L.W.: Riordan group involutions. Linear Algebra Appl. 428, 941–952 (2008)
4. Cohen, M.M.: Elements of finite order in the group of formal power series under composition, arXiv:1804.00059v2
5. Cohen, M.M.: Elements of finite order in the Riordan group, arXiv:1806.06432v2