@article{AIHPA_1967__6_4_343_0,
     author = {Papapetrou, A. and Hamoui, A.},
     title = {Surfaces caustiques d\'eg\'en\'er\'ees dans la solution de {Tolman.} {La} singularit\'e physique en relativit\'e g\'en\'erale},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {343--364},
     publisher = {Gauthier-Villars},
     volume = {6},
     number = {4},
     year = {1967},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1967__6_4_343_0/}
}