@article{NSJOM_2008_38_3a_20,
     author = {E. G. Celakovska\'c},
     title = {On {Isometry} {Links} between

 {4-Velocity} {Vectors}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {165-172},
     publisher = {mathdoc},
     volume = {38},
     number = {3},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2008_38_3a_20/}
}