Local Existence of Weak Solutions to the Quasi-Linear Wave Equation for Large Initial Values.
Estimates for the asymptotic behavior of solutions of the Helmholtz equation, with an application to second order elliptic differential operators with variable coefficients (Erratum).
Highfrequency asymptotics of the field scattered by an obstacle near tangential rays.
Existence of threedimensional, steady, inviscid, incompressible flows with nonvanishing vorticity.
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