International Workshop on Symmetry and Perturbation Theory Cala Gonone, Italy, ebrary, Inc, Bambusi, D., Gaeta, G., & Cadoni, M. (2001). Symmetry and Perturbation Theory: Proceedings of the international conference SPT 2001, Cala Gonone, Sardinia, Italy, 6-13 May 2001. World Scientific.

International Workshop on Symmetry and Perturbation Theory Cala Gonone, Italy, Inc ebrary, Dario Bambusi, Giuseppe Gaeta, and Mariano Cadoni. Symmetry and Perturbation Theory: Proceedings of the International Conference SPT 2001, Cala Gonone, Sardinia, Italy, 6-13 May 2001. River Edge, New Jersey: World Scientific, 2001.

International Workshop on Symmetry and Perturbation Theory Cala Gonone, Italy, et al. Symmetry and Perturbation Theory: Proceedings of the International Conference SPT 2001, Cala Gonone, Sardinia, Italy, 6-13 May 2001. World Scientific, 2001.