%0 Journal Article %A V. I. Mogilevskii %T On spectral and pseudospectral functions of first-order symmetric systems %J Ufa mathematical journal %D 2015 %P 115-136 %V 7 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/UFA_2015_7_2_a8/ %G en %F UFA_2015_7_2_a8