@article{SIGMA_2008_4_a87,
     author = {Shirley Bromberg and Alberto Medina},
     title = {Geodesically {Complete} {Lorentzian} {Metrics} on {Some} {Homogeneous} {3~Manifolds}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2008},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a87/}
}