%0 Journal Article %A Dragi Radojević %T Eigen values and principal directions of the energy momentum tensor of a perfect charged fluid %J Theoretical and applied mechanics %D 1979 %P 151 %V 5 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TAM_1979_5_1_a14/ %G en %F TAM_1979_5_1_a14