@article{baxter:1961:pds,
    author = {Baxter, Glen},
     title = {Polynomials defined by a difference system},
   journal = {J. Math. Anal. Appl.},
    volume = {2},
      year = {1961},
    number = {2},
     pages = {223–263},
   mrclass = {42.15 (60.66)},
  mrnumber = {MR0126125 (23 \#A3421)},
mrreviewer = {F. L. Spitzer},
       doi = {10.1016/0022-247X(61)90033-6},
     zblno = {0116.35704}}