@article{AIHPA_1979__30_1_27_0,
     author = {Modugno, Marco and Stefani, Gianna},
     title = {On the geometrical structure of shock waves in general relativity},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {27--50},
     publisher = {Gauthier-Villars},
     volume = {30},
     number = {1},
     year = {1979},
     mrnumber = {535046},
     zbl = {0418.76093},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1979__30_1_27_0/}
}