@article{nye:2007:dls,
    author = {Nye, J. F.},
     title = {Dislocation lines in the swallowtail diffraction
              catastrophe},
   journal = {Proc. Roy. Soc. Lond. Ser. A},
  fjournal = {Proceedings of The Royal Society of London. Series A.
              Mathematical, Physical and Engineering Sciences},
    volume = {463},
      year = {2007},
     pages = {343–355},
      issn = {1364-5021},
       doi = {10.1098/rspa.2006.1765},
     zblno = {1137.58015}}