@article{377951,
      author = {Gaeta, Giuseppe, and Vitolo, Raffaele. and Walcher,  Sebastian.},
      url = {http://library.usi.edu/record/377951},
      title = {Symmetry and perturbation theory proceedings of the  International Conference SPT 2007, Otranto Italy, 2-9 June  2007 / [electronic resource] :. International Conference on  Symmetry and Perturbation Theory},
      publisher = {World Scientific,},
      recid = {377951},
      pages = {xiii, 295 p. :},
      address = {Singapore :},
      year = {2007},
}