## On the short wave asymptotic behaviour of solutions of stationary problems and the asymptotic behaviour as $$t\rightarrow\infty$$ of solutions of non-stationary problems.(English)Zbl 0318.35006

### MSC:

 35B40 Asymptotic behavior of solutions to PDEs 35L35 Initial-boundary value problems for higher-order hyperbolic equations 35G15 Boundary value problems for linear higher-order PDEs 35B45 A priori estimates in context of PDEs 35S15 Boundary value problems for PDEs with pseudodifferential operators
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