G. Dattoli et al., GENERALIZED BESSEL-FUNCTIONS WITHIN THE GROUP REPRESENTATION FORMALISM, Nuovo cimento della Societa italiana di fisica. B, Relativity, classical and statistical physics, 111(2), 1996, pp. 143-164
The generalized Bessel functions are framed within the context of the
group representation theory, where they are recognized both as matrix
elements of an appropriate representation of the relevant group and as
basis functions of the quasi-regular representation, in full analogy
with the group-theoretic view to the ordinary Bessel functions.