TY - BOOK AU - Gaeta Giuseppe Et Al TI - Symmetry and Perturbation Theory - Proceedings of the International Conference on Spt2004 SN - 9789812702142 PB - World Scientific KW - Nonlinear Science, Chaos & Dynamical Systems UR - https://www.worldscientific.com/worldscibooks/10.1142/5734#t=toc ER -