@article{BMMS_2000_23_2_a7,
     author = {Nejat Ekmek\c{c}i and H. Hilmi Hacisalihoglu and Kazim Ilarslan},
     title = {Harmonic {Curvatures} in {Lorentzian
}                        {SpaceNejat} {Ekmek\c{c}i,
}                        {H.} {Hilmi} {Hacisalihoglu} and {Kazim} {Ilarslan}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2000},
     volume = {23},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2000_23_2_a7/}
}