[Reports] / Amer.inst.of aeronautics and astronautics. N 90-3916 : Spectral solution of acoustic wave propagation problems : Rep.presented at the AIAA 13th aeroacoustics conf.,Oct.22-24,1990,Tallahassee(Fl.) / D.Kopriva, 1990. - 11 p. - Текст : непосредственный.