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@article{MAN_1995__301_4_165300, author = {T. Branson and G. Olafsson}, title = {Huyghens' principle in {Riemannian} symmetric spaces.}, journal = {Mathematische Annalen}, pages = {445--462}, publisher = {mathdoc}, volume = {301}, number = {4}, year = {1995}, zbl = {0822.43002}, url = {http://geodesic.mathdoc.fr/item/MAN_1995__301_4_165300/} }
T. Branson; G. Olafsson. Huyghens' principle in Riemannian symmetric spaces.. Mathematische Annalen, Tome 301 (1995) no. 4, pp. 445-462. http://geodesic.mathdoc.fr/item/MAN_1995__301_4_165300/