@article{JRAM_1974__271_151509,
     author = {H.B. Mittal},
     title = {Unusual generating relations for polynomial sets.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {122--138},
     publisher = {mathdoc},
     volume = {271},
     year = {1974},
     zbl = {0305.33011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1974__271_151509/}
}