@article{schafke:1961:bc,
    author = {Sch{\"a}fke, Friedrich Wilhelm},
     title = {Ein {V}erfahren zur {B}erechnung des charakteristischen
              {E}xponenten der {M}athieuschen {D}ifferentialgleichung {I}},
   journal = {Numer. Math.},
  fjournal = {Numerische Mathematik},
    volume = {3},
      year = {1961},
    number = {1},
     pages = {30–38},
      issn = {0029-599X},
   mrclass = {65.60},
  mrnumber = {MR0127538 (23 \#B584)},
mrreviewer = {S. C. van Veen},
       doi = {10.1007/BF01385999},
     zblno = {0100.08301}}