@article{10_2307_121102,
     author = {Siddhartha Sahi},
     title = {Nonsymmetric {Koornwinder} polynomials and duality},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {150},
     number = {1},
     doi = {10.2307/121102},
     zbl = {0941.33013},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/121102/}
}