@article{Kontoge1998JNTp110136,
  title = {{The group of automorphisms of the function fields of the curve {$x^n+y^m+1=0$}}},
  author = {Kontogeorgis, Aristides I.},
  file = {pap1.pdf},
  volume = {72},
  pages = {110{--}136},
  url = {http://dx.doi.org/10.1006/jnth.1998.2251},
  doi = {10.1006/jnth.1998.2251},
  year = {1998},
  journal = {J. Number Theory},
  abstract = {We study the group of automorphisms of the function fields of the curves xn+ym-1=0 This groups is bigger than {\mbox{$\mu$}}(m)x{\mbox{$\mu$}}(n) in case m | n. If moreover n-1 is a power of the characteristic, then the group order exceeds the Hurwitz bound},
  issn = {0022-314X},
  number = {1}
}