@article{duistermaat:1974:oi,
    author = {Duistermaat, J. J.},
     title = {Oscillatory integrals, {L}agrange immersions and unfolding
              of singularities},
   journal = {Comm. Pure Appl. Math.},
    volume = {27},
      year = {1974},
     pages = {207–281},
   mrclass = {58G99 (58C25 35S99)},
  mrnumber = {MR0405513 (53 \#9306)},
mrreviewer = {Alan Weinstein},
     zblno = {0285.35010}}