Transformations preserving the Hankel transform. French, Christopher — 2007 Journal of Integer Sequences [electronic only]
Generalized Catalan numbers and generalized Hankel transformations. Chamberland, Marc; French, Christopher — 2007 Journal of Integer Sequences [electronic only]
Hankel transforms of linear combinations of Catalan numbers. Dougherty, Michael; French, Christopher; Saderholm, Benjamin; Qian, Wenyang — 2011 Journal of Integer Sequences [electronic only]