@article{gasper:1972:itt,
    author = {Gasper, George},
     title = {An inequality of {T}ur\'an type for {J}acobi polynomials},
   journal = {Proc. Amer. Math. Soc.},
  fjournal = {Proceedings of the American Mathematical Society},
    volume = {32},
      year = {1972},
     pages = {435–439},
      issn = {0002-9939},
   mrclass = {33.40},
  mrnumber = {MR0289826 (44 \#7013)},
mrreviewer = {A. E. Danese},
       doi = {10.2307/2037835},
     zblno = {0237.33009}}