1. Atluri, S.N. and Grannell, I.J.: Boundary element methods (BEM) and combination of BEM-FEM. Report Nr. GIT-ESM-SA-78-16 (1978).
2. Bernardi, C., Debit, N. and Maday, Y.: Couplage de méthodes spectrales et d’éléments finis: premiers résultats d’approximation. C.R. Acad. Sc. Paris 305 Ser. I, 353–356 (1986).
3. Bernardi, C., Maday, Y. and Patera, A.T.: A new nonconforming approach to domain decomposition: the mortar element method. In: Collège de Prance Seminar XI (eds. Brezis, H. and Lions, J.-L.) 13–51 (1994).
4. Brezzi, F. and Fortin, M.: Mixed and Hybrid Finite Element Methods. Springer-Verlag, Berlin (1991).
5. Brezzi, F. and Johnson, C.: On the coupling of integral and finite element methods. Calcolo 16, 189–201 (1979).