@article{1104250856, author = {Eschenburg, J.-H. and Galloway, G. J.}, title = {Lines in space-times}, journal = {Comm. Math. Phys.}, volume = {143}, number = {2}, year = {1992}, pages = { 209-216}, language = {en}, url = {http://dml.mathdoc.fr/item/1104250856} }
Eschenburg, J.-H.; Galloway, G. J. Lines in space-times. Comm. Math. Phys., Tome 143 (1992) no. 2, pp. 209-216. http://gdmltest.u-ga.fr/item/1104250856/