TY JOUR TI About spectrum differential operator with matrix potential KW eigenvalue KW the method of similar operators KW perturbed linear operator JO Actual directions of scientific researches of the XXI century: theory and practice AU Uskova, N.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov