[Reports] / Amer.inst.of aeronautics and astronautics. N 90-3946 : two-step method for evolving acoustic systems to a steady-state : Rep.presented at the AIAA 13th aeroacoustics conf.,Oct.22-24,1990,Tallahassee(Fl.) / W.Watson,M.Myers, 1990. - 13 p. - Текст : непосредственный.