@article{BMMS_1998_21_2_a8,
     author = {Mehmet Bektas and Mahmut Erg\"ut and Dursun Soylu},
     title = {The {Characterization} of the {Spherical
}                        {Timelike} {Curves} in {3-Dimensional} {Lorentzian} {Space}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {1998},
     volume = {21},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_1998_21_2_a8/}
}