@article{10890,
  author = {Charles Jaffé and William Reinhardt},
  title = {Time-independent methods in classical mechanics: Calculation of invariant tori and semiclassical energy levels via classical Van Vleck transformations},
  year = {1979},
  journal = {The Journal of Chemical Physics},
  volume = {71},
  pages = {1862},
  month = {Jan-01-1979},
  issn = {00219606},
  doi = {10.1063/1.438538},
}