@article{runckel:1971:zer,
    author = {Runckel, Hans-J.},
     title = {On the zeros of the hypergeometric function},
   journal = {Math. Ann.},
  fjournal = {Mathematische Annalen},
    volume = {191},
      year = {1971},
    number = {1},
     pages = {53–58},
      issn = {0025-5831},
   mrclass = {33.20},
  mrnumber = {MR0279346 (43 \#5068)},
mrreviewer = {R. C. Varma},
       doi = {10.1007/BF01433471},
     zblno = {0208.32701}}