@article{ursell:1980:ilp,
    author = {Ursell, F.},
     title = {Integrals with a large parameter: A double complex integral
              with four nearly coincident saddle-points},
   journal = {Math. Proc. Cambridge Philos. Soc.},
  fjournal = {Mathematical Proceedings of the Cambridge Philosophical
              Society},
    volume = {87},
      year = {1980},
    number = {2},
     pages = {249–273},
      issn = {0305-0041},
     coden = {MPCPCO},
   mrclass = {41A60 (30E15)},
  mrnumber = {MR0553582 (81j:41050)},
mrreviewer = {F. I. Ibragimov},
       doi = {10.1017/S0305004100056711},
     zblno = {0436.32004}}