2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/169830In a recent paper we introduced a multivariable generalisation of the Bessel polynomials, depending on one extra parameter, and related to the so-called hyperbolic Sutherland model with external Morse potential. In this paper we obtain a corresponding multivariable generalisation of a well-known orthogonality relation for the (one-variable) Bessel polynomials due to Krall and Frink.references added, a few minor misprints correctedClassical Analysis and ODEstext