@incollection{koornwinder:1975:tva,
    author = {Koornwinder, Tom H.},
     title = {Two-variable Analogues of the Classical Orthogonal
              Polynomials},
 booktitle = {Theory and Application of Special Functions},
    editor = {Askey, Richard A.},
     pages = {435–495},
 publisher = {Academic Press},
   address = {New York},
      year = {1975},
   mrclass = {33A75},
  mrnumber = {MR0402146 (53 \#5967)},
mrreviewer = {R. A. Askey},
     zblno = {0326.33002}}