@article{10_4153_CJM_1967_102_6,
     author = {Alexandrov, A. D.},
     title = {A {Contribution} to {Chronogeometry}},
     journal = {Canadian journal of mathematics},
     pages = {1119--1128},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-102-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-102-6/}
}