1. M. Abramowitz, I.A. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Reprint of the 1972 edition (Dover Publications, Inc., New York, 1992)
2. G.E. Andrews, R. Askey, R. Roy, Special Functions (Cambridge University Press, Cambridge, 1999)
3. E. Barcucci, A. Del Lungo, E. Pergola, R. Pinzani, ECO: a methodology for the enumeration of combinatorial objects. J. Differ. Equ. Appl. 5, 435–490 (1999)
4. P. Barry, Exponential Riordan arrays and permutation enumeration. J. Integer Seq. 13(9), Article 10.9.1, 16 pp. (2010)
5. P. Barry, Combinatorial polynomials as moments, Hankel transforms, and exponential Riordan arrays. J. Integer Seq. 14(6), Article 11.6.7, 14 pp. (2011)