@article{vanderwaerden:1951:msp,
    author = {{van der Waerden}, B. L.},
     title = {On the method of saddle points},
   journal = {Appl. Sci. Research B.},
    volume = {2},
      year = {1951},
     pages = {33–45},
   mrclass = {27.0X},
  mrnumber = {MR0041185 (12,808g)},
mrreviewer = {E. T. Copson},
       doi = {10.1017/BF02919754},
     zblno = {0045.06603}}