no. 2
On the duality of local observables
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 22 (1975) no. 2, pp. 123-130. 
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     author = {Chen, Etang},
     title = {On the duality of local observables},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {123--130},
     publisher = {Gauthier-Villars},
     volume = {22},
     number = {2},
     year = {1975},
     mrnumber = {398332},
     zbl = {0303.46059},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1975__22_2_123_0/}
}
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Chen, Etang. On the duality of local observables. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 22 (1975) no. 2, pp. 123-130. http://www.numdam.org/item/AIHPA_1975__22_2_123_0/

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