Asymptotics of Multivariate Sequences, part I. Smooth points of the   singular variety
  Given a multivariate generating function F, we determine asymptotics for the coefficients. Our approach is to use Cauchy's integral formula near singular points of F, resulting in a tractable oscillating integral. This paper treats the case where the singular point of F is a smooth point of a surface of poles. Companion papers will treat singular points of F where the local geometry is more complicated, and for which other methods of analysis are not known. 
R. Pemantle (Ohio State University), M. C. Wilson (University of   Montana)