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2. Some remarks on the Bergman-Gilbert integral operator;Carroll;J. Math. Pures Appl.,1984
3. Constructive Methods for Elliptic Partial Differential Equations;Gilbert,1974
4. A transmutation approach to underwater sound propagation;Gilbert;Wave Motion,1986
5. Approximate expansion for function theoretic representation of solutions of the Helmholtz equation;Duston,1986