@article{AIHPA_1981__35_2_131_0,
     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/}
}