@article{AIHPA_1979__31_4_399_0,
     author = {Choquet-Bruhat, Yvonne and Christodoulou, Demetrios and Francaviglia, Mauro},
     title = {On the wave equation in curved spacetime},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {399--414},
     publisher = {Gauthier-Villars},
     volume = {31},
     number = {4},
     year = {1979},
     mrnumber = {574143},
     zbl = {0454.58016},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1979__31_4_399_0/}
}