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Continue to ChatNonreflecting boundary conditions in acoustics for finite element methods based upon off surface boundary integral equations - https://avesis.itu.edu.tr/yayin/0565dbb2-c30b-4bad-bb5f-6ec2c8120e2b/nonreflecting-boundary-conditions-in-acoustics-for-finite-element-methods-based-upon-off-surface-boundary-integral-equations