@article{NSJOM_2005_35_2a_9,
     author = {E. Kasap},
     title = {A method of the determination 

 of a geodesic curve on ruled surface with timelike rulings},
     journal = {Novi Sad Journal of Mathematics},
     pages = {103-110},
     publisher = {mathdoc},
     volume = {35},
     number = {2},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2005_35_2a_9/}
}