@article{394963,
      recid = {394963},
      author = {Nesbet, R. K.},
      title = {Variational principles and methods in theoretical physics  and chemistry [electronic resource] /},
      publisher = {Cambridge University Press,},
      address = {New York :},
      pages = {xiv, 229 p. :},
      year = {2003},
      url = {http://library.usi.edu/record/394963},
}