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The First Boundary Value Problem for εΔu + A(x, y)u x + B(x, y)u y + C(x, y)u = D(x, y) for Small ε

Norman Levinson

Annals of Mathematics · 1950 · 98 citations · 1 references

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Asymptotic solution of boundary value problems for the differential equation ΔU+λ∂∂xU=λf(x,y)

Wolfgang Wasow · Duke Mathematical Journal · 1944 · 28 citations

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