@article{schafke:1962:bes,
    author = {Sch{\"a}fke, Friedrich Wilhelm and Groh, Helmut},
     title = {Zur {B}erechnung der {E}igenwerte der
              {S}ph\"aroiddifferentialgleichung.},
   journal = {Numer. Math.},
  fjournal = {Numerische Mathematik},
    volume = {4},
      year = {1962},
     pages = {310–312},
  language = {German},
      issn = {0029-599X},
   mrclass = {33.28},
  mrnumber = {MR0143964 (26 \#1512)},
mrreviewer = {I. Marx},
       doi = {10.1007/BF01386324},
     zblno = {0113.32105}}