@article{SIGMA_2005_1_a16,
     author = {George Yu. Bogoslovsky},
     title = {Subgroups of the {Group} of {Generalized} {Lorentz} {Transformations} and {Their} {Geometric} {Invariants}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2005},
     volume = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2005_1_a16/}
}