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Morfey, C.L. (author), Hu, Z.W. (author), Wright, M.C.M. (author)Two extensions to Lighthill's aeroacoustic analogy are presented. First, equivalent sources due to initial conditions are derived that supplement those due to boundary conditions, as given by Ffowcs Williams & Hawkings. The resulting exact inhomogeneous wave equation is then reformulated with pressure rather than density as the wave variable,...conference paper 2006