@article{berry:1980:ppi,
    author = {Berry, M. V. and Wright, F. J.},
     title = {Phase-space projection identities for diffraction
              catastrophes},
   journal = {J. Phys. A},
  fjournal = {Journal of Physics. A. Mathematical and General},
    volume = {13},
      year = {1980},
    number = {1},
     pages = {149–160},
      issn = {0305-4470},
     coden = {JPHAC5},
   mrclass = {78A45 (58C28)},
  mrnumber = {MR0553540 (82k:78006)},
mrreviewer = {J. S. Joel},
       doi = {10.1088/0305-4470/13/1/016},
     zblno = {0422.58011}}