@article{MS2_1990__67_2_167125,
     author = {Karl H. Hofmann and Joachim Hilgert},
     title = {On the casual structure of homogeneous manifolds.},
     journal = {Mathematica Scandinavica},
     pages = {119--144},
     publisher = {mathdoc},
     volume = {67},
     number = {2},
     year = {1990},
     zbl = {0739.53041},
     url = {http://geodesic.mathdoc.fr/item/MS2_1990__67_2_167125/}
}