@article{SIGMA_2016_12_a20,
     author = {Mourad E. H. Ismail and Ruiming Zhang},
     title = {Classes of {Bivariate} {Orthogonal} {Polynomials}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2016},
     volume = {12},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2016_12_a20/}
}