A generalization of metric tensor and its application
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 4, pp. 287-293. 
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     author = {Perng, Jeng J.},
     title = {A generalization of metric tensor and its application},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
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     volume = {13},
     number = {4},
     year = {1970},
     mrnumber = {275838},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1970__13_4_287_0/}
}
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Perng, Jeng J. A generalization of metric tensor and its application. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 13 (1970) no. 4, pp. 287-293. http://archive.numdam.org/item/AIHPA_1970__13_4_287_0/

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