Jf. Vandiejen, MULTIVARIABLE CONTINUOUS HAHN AND WILSON POLYNOMIALS RELATED TO INTEGRABLE DIFFERENCE-SYSTEMS, Journal of physics. A, mathematical and general, 28(13), 1995, pp. 369-374
Multivariable generalizations of the continuous Hahn and Wilson polyno
mials are introduced as eigenfunctions of rational Ruijsenaars-type di
fference systems with an external field.