@article{KJM_2005_28_1_a6,
     author = {Novica Bla\v{z}i\'c},
     title = {Conformally {Osserman} {Lorentzian} manifolds},
     journal = {Kragujevac Journal of Mathematics},
     pages = {87 - 96},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {2005},
     zbl = {1143.53336},
     url = {http://geodesic.mathdoc.fr/item/KJM_2005_28_1_a6/}
}