@article{arnold:1972:nff,
    author = {Arnol'd, V. I.},
     title = {Normal forms of functions near degenerate critical points, the
              {W}eyl groups ${A}_{k},{D}_{k},{E}_{k}$ and {L}agrangian
              singularities},
   journal = {Funkcional. Anal. i Prilo\v zen.},
    volume = {6},
      year = {1972},
    number = {4},
     pages = {3–25},
      note = {In Russian. English translation: Functional Anal. Appl.,
              {\bf{6}}(1973), pp. 254–272.},
  language = {Russian},
   mrclass = {58C25},
  mrnumber = {MR0356124 (50 \#8595)},
mrreviewer = {G. R. Belickii},
     zblno = {0278.57011}}