TY JOUR TI Generalized method of superposition in problems on harmonic oscillations of rectangular domains of general type KW harmonic oscillations KW the method of superposition KW isotropy JO Actual directions of scientific researches of the XXI century: theory and practice AU Luparenko, E.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov