1. Classes of the n-dimensional Lorentz group;Abraham;Proc. Indian Acad. Sci., Sect. A,1948
2. Groups of conformal transformations of Riemannian spaces;Alekseevsky;Mat. Sb.,1972
3. Lorentzian manifolds with transitive conformal group;Alekseevskii;Note Mat.,2017
4. Self-similar Lorentzian manifolds;Alekseevskii;Ann. Glob. Anal. Geom.,1985