@inbook{7624,
  author = {David Norcross},
  title = {Numerical Methods for Asymptotic Solutions of Scattering Equations},
  year = {1983},
  pages = {55-73},
  publisher = {Springer US},
  address = {Boston, MA},
  isbn = {978-1-4613-3538-2},
  doi = {10.1007/978-1-4613-3536-8_2},
}