@article{wolf:1998:otc,
    author = {Wolf, Gerhard},
     title = {On the central connection problem for the double confluent
              {H}eun equation},
   journal = {Math. Nachr.},
  fjournal = {Mathematische Nachrichten},
    volume = {195},
      year = {1998},
     pages = {267–276},
      issn = {0025-584X},
   mrclass = {34A20 (34E05)},
  mrnumber = {MR1654713 (99f:34005)},
     zblno = {0919.34007}}