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H.A. Mang, Z.Y. Chen, P. Torzicky:
"On the Symmetricability of Coupling Matrices for BEM-FEM Discretizations of Solids";
in: "Proceedings of the IUTAM Symposium on Advanced Boundary Element Methods", IUTAM, 1987, S. 241 - 248.

In order to exploit the complementary advantages of the BEM and the FEM optimally, discretization of parts of a solid by the BEM and of the remaining parts by the FEM may be useful. A feature of the employed "local FEM approach" for the coupling of such discretizations are "couling matrices" relating unknown node displacements on a typical coupling interface to known node forces on this interface. Because of the nature of the employed BEM, the couling matrices are unsymmetric. The following article is concerned with thier symmetricability.