%0 Journal Article %A M. A. Naimark %T Unitary representations of the Lorentz group in the space $\Pi_k$ %J Doklady Akademii Nauk %D 1963 %P 1064-1067 %V 152 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_152_5_a12/ %G ru %F DAN_1963_152_5_a12