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@article{PORMA_1994__51_2_47284, author = {Frattarolo, Walter}, title = {A {Hadamard} type theorem for the space-time.}, journal = {Portugaliae mathematica}, pages = {257--269}, publisher = {mathdoc}, volume = {51}, number = {2}, year = {1994}, zbl = {0824.53075}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1994__51_2_47284/} }
Frattarolo, Walter. A Hadamard type theorem for the space-time.. Portugaliae mathematica, Tome 51 (1994) no. 2, pp. 257-269. http://geodesic.mathdoc.fr/item/PORMA_1994__51_2_47284/