%0 Journal Article %A V. P. Belov %T Groups of spacetime transformations and symmetries of four-dimensional spacetime.~II %J Teoretičeskaâ i matematičeskaâ fizika %D 1994 %P 136-157 %V 101 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1994_101_1_a11/ %G ru %F TMF_1994_101_1_a11