%0 Journal Article %A A. F. Krutov %A V. E. Troitsky %T Construction of form factors of composite systems by a generalized Wigner--Eckart theorem for the Poincar\'e group %J Teoretičeskaâ i matematičeskaâ fizika %D 2005 %P 258-277 %V 143 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_2005_143_2_a5/ %G ru %F TMF_2005_143_2_a5