@article{burchnall:1940:exp,
    author = {Burchnall, J. L. and Chaundy, T. W.},
     title = {Expansions of {A}ppell's double hypergeometric functions},
   journal = {Quart. J. Math., Oxford Ser.},
    volume = {11},
      year = {1940},
     pages = {249–270},
   mrclass = {33.0X},
  mrnumber = {MR0003885 (2,287d)},
mrreviewer = {G. Szeg{\"o}},
       doi = {10.1093/qmath/os-11.1.249},
     zblno = {0025.16301}}