Integral representations of Catalan and related numbers. Penson, K.A.; Sixdeniers, J.-M. — 2001 Journal of Integer Sequences [electronic only]
Extended Bell and Stirling numbers from hypergeometric exponentiation. Sixdeniers, J.-M.; Penson, K.A.; Solomon, A.I. — 2001 Journal of Integer Sequences [electronic only]
Motzkin numbers, central trinomial coefficients and hybrid polynomials. Blasiak, P.; Dattoli, G.; Horzela, A.; Penson, K.A.; Zhukovsky, K. — 2008 Journal of Integer Sequences [electronic only]