@article{askey:1976:pjp,
    author = {Askey, Richard and Gasper, George},
     title = {Positive {J}acobi polynomial sums. {II}},
   journal = {Amer. J. Math.},
    volume = {98},
      year = {1976},
    number = {3},
     pages = {709–737},
   mrclass = {33A65 (42A52)},
  mrnumber = {MR0430358 (55 \#3363)},
mrreviewer = {F. Schipp},
     links = {\URL[FullText]{http://links.jstor.org/sici?sici=0002-9327%28197623%2998%3A3%3C709%3APJPSI%3E2.0.CO%3B2-0}},
     zblno = {0355.33005}}