@article{karlin:1961:hpf,
    author = {Karlin, Samuel and McGregor, James L.},
     title = {The {H}ahn polynomials, formulas and an application},
   journal = {Scripta Math.},
    volume = {26},
      year = {1961},
     pages = {33–46},
   mrclass = {33.40},
  mrnumber = {MR0138806 (25 \#2249)},
mrreviewer = {L. J. Slater},
     zblno = {0104.29103}}