@article{1364100,
      author = {Bender, Carl M., and Orszag, Steven A.,},
      url = {http://library.usi.edu/record/1364100},
      title = {Advanced mathematical methods for scientists and engineers  I : asymptotic methods and perturbation theory /},
      recid = {1364100},
      pages = {1 online resource (604 pages) :},
}