@article{AIHPA_1970__13_4_287_0,
     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},
     pages = {287--293},
     publisher = {Gauthier-Villars},
     volume = {13},
     number = {4},
     year = {1970},
     mrnumber = {275838},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1970__13_4_287_0/}
}