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@article{MZ_1977__155_172561, author = {Pierre H. B\'erard}, title = {On the {Wave} {Equation} on a {Compact} {Riemannian} {Manifold} withour {Conjugate} {Points.}}, journal = {Mathematische Zeitschrift}, pages = {249--276}, publisher = {mathdoc}, volume = {155}, year = {1977}, zbl = {0341.35052}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__155_172561/} }
Pierre H. Bérard. On the Wave Equation on a Compact Riemannian Manifold withour Conjugate Points.. Mathematische Zeitschrift, Tome 155 (1977), pp. 249-276. http://geodesic.mathdoc.fr/item/MZ_1977__155_172561/