@article{ursell:1972:ilp,
    author = {Ursell, F.},
     title = {Integrals with a large parameter. {S}everal nearly
              coincident saddle-points},
   journal = {Proc. Cambridge Philos. Soc.},
    volume = {72},
      year = {1972},
     pages = {49–65},
   mrclass = {41A60},
  mrnumber = {MR0299995 (45 \#9043)},
mrreviewer = {L. Berg},
       doi = {10.1017/S0305004100050945},
     zblno = {0238.41008}}