@incollection{berry:1980:sga,
    author = {Berry, M. V.},
     title = {Some Geometric Aspects of Wave Motion: Wavefront Dislocations,
              Diffraction Catastrophes, Diffractals},
 booktitle = {Geometry of the Laplace Operator (Proc. Sympos. Pure Math.,
              Univ. Hawaii, Honolulu, Hawaii, 1979)},
    volume = {36},
     pages = {13–28},
 publisher = {Amer. Math. Soc.},
   address = {Providence, R.I.},
      year = {1980},
   mrclass = {58C28 (78A45)},
  mrnumber = {MR0573427 (81f:58012)},
mrreviewer = {I. Stewart},
     zblno = {0437.73014}}