[1] Sommerfeld,A.,Partial Differential Equation in Physics,Academic Press(1949). [2] Schenck,H.A.,Improved integral formulation for acoustics radiation problems,J.Acoust.Soc.Am.,44(1968),41-58. [3] Burton.A.J.and G.F.Miller,The application of integral equation methods to the numerical solution of some exterior boundary value problems,Proc.R.Soc.London.,Ser.A.,323(1971),201-210. [4] Waterman,P.C.,New formulation of acoustic scattering,J.Acoust.Soc.Am.,45(1969),1417-1429. [5] Kleinman,R.E.and G.F.Roach,Boundary integral equations for the three-dimensional Helmholtz equation,SIAM,Review,16(1974),214-236. [6] Piaszczyk,C.M.,Acoustic radiation from vibrating surface at characteristic frequencies,J.Acoust.Soc.Am.,75(1984),363-375. [7] Martin,P.A.,On the null-field equations for the exterior problems of acoustics,Q.J.Mech Appl.Math.,33(1980),385-396. [8] Brod,K.,On the uniqueness of solution for all wave numbers in acoustic radiation,J.Acoust.Soc.Am.,76(1984),1238-1243. [9] Filippi,P.J.T.,.Integral equations in acoustics,Theoretical Acoustics and Numerical Techniques,Ed.by P.Filippi,Springer-Verlag(1983),1-49. [10] Meyer,W.L,W.A.Bell,B.T.Zinn and M.P.Stallybrass,Boundary integral solution of three dimensional acoustic radiation problems,J.Sound and Vib.,59,2(1978),242-262. [11] Amini,S.and D.T.Wilton,An investigation of boundary element methods for the exterior acoustic problem,Compu.Meth.in Appl.Mech.and Eng.,54(1986),49-65. [12] Smirnov,V.I.,A Course of Higher Mathematics,Pergamon Press,Oxford(1964). [13] Courant,R.and D.Hilbert,Methods of Mathematical Physics,Vol II,Science Press,Beijing(1977).(Chinese version) |