@article{AIHPA_1977__27_2_115_0,
     author = {Ba\.za\'nski, Stanislaw L.},
     title = {Kinematics of relative motion of test particles in general relativity},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {115--144},
     publisher = {Gauthier-Villars},
     volume = {27},
     number = {2},
     year = {1977},
     mrnumber = {469066},
     zbl = {0377.53014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1977__27_2_115_0/}
}