@article{nye:2006:dlh,
    author = {Nye, J. F.},
     title = {Dislocation lines in the hyperbolic umbilic 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 = {462},
      year = {2006},
     pages = {2299–2313},
      issn = {1364-5021},
   mrclass = {58K35 (78Axx)},
  mrnumber = {MR2245172 (2007j:58048)},
       doi = {10.1098/rspa.2006.1683},
     zblno = {1149.35389}}