The Rahman polynomials are bispectral.
Grünbaum, F. Alberto
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 3 (2007), / Harvested from The Electronic Library of Mathematics
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Publié le : 2007-01-01
EUDML-ID : urn:eudml:doc:45157 
@article{05241578,
     title = {The Rahman polynomials are bispectral.},
     journal = {SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]},
     volume = {3},
     year = {2007},
     zbl = {1193.33027},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05241578}
}

Grünbaum, F. Alberto. The Rahman polynomials are bispectral.. SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only], Tome 3 (2007) . http://gdmltest.u-ga.fr/item/05241578/