no. 2
Characterizing the conformality in a Minkowski space
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 35 (1981) no. 2, pp. 131-148. 
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     author = {Popovici, Iulian and Constantin Radulescu, Dan},
     title = {Characterizing the conformality in a {Minkowski} space},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {131--148},
     publisher = {Gauthier-Villars},
     volume = {35},
     number = {2},
     year = {1981},
     mrnumber = {637239},
     zbl = {0476.51014},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1981__35_2_131_0/}
}
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Popovici, Iulian; Constantin Radulescu, Dan. Characterizing the conformality in a Minkowski space. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 35 (1981) no. 2, pp. 131-148. http://www.numdam.org/item/AIHPA_1981__35_2_131_0/

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