@article{trinkaus:1977:adc,
    author = {Trinkaus, H. and Drepper, F.},
     title = {On the analysis of diffraction catastrophes},
   journal = {J. Phys. A},
    volume = {10},
      year = {1977},
     pages = {L11–L16},
       doi = {10.1088/0305-4470/10/1/003}}