@article{AIHPA_1976__25_1_67_0,
     author = {Schomblond, Christiane and Spindel, Philippe},
     title = {Conditions d{\textquoteright}unicit\'e pour le propagateur $\Delta ^1 (x, y)$ du champ scalaire dans l{\textquoteright}univers de de {Sitter}},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {67--78},
     publisher = {Gauthier-Villars},
     volume = {25},
     number = {1},
     year = {1976},
     zbl = {0356.53010},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1976__25_1_67_0/}
}