Approximate symmetries and their spontaneous breakdown
Annales de l'I.H.P. Physique théorique, Tome 22 (1975) no. 2, pp. 159-172

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     author = {Esposito, R. and Gallavotti, G.},
     title = {Approximate symmetries and their spontaneous breakdown},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
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     publisher = {Gauthier-Villars},
     volume = {22},
     number = {2},
     year = {1975},
     mrnumber = {389108},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1975__22_2_159_0/}
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Esposito, R.; Gallavotti, G. Approximate symmetries and their spontaneous breakdown. Annales de l'I.H.P. Physique théorique, Tome 22 (1975) no. 2, pp. 159-172. http://geodesic.mathdoc.fr/item/AIHPA_1975__22_2_159_0/