@article{sleeman:1969:nli,
    author = {Sleeman, B. D.},
     title = {Non-linear integral equations for {H}eun functions},
   journal = {Proc. Edinburgh Math. Soc. (2)},
    volume = {16},
      year = {1969},
     pages = {281–289},
   mrclass = {45.30 (33.00)},
  mrnumber = {MR0259531 (41 \#4169)},
mrreviewer = {J. D. DePree},
       doi = {10.1017/S0013091500012943},
     zblno = {0187.36005}}