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This article deals with the establishment of masonic lodges in Germany and their function as a zone of encounters between intellectuals.

On the generation of surface waves in frequency selective structures

In this paper, we discuss and analyze the criteria for the existence and the generation of surface modes in dielectric slabs with and without metallic layers (frequency selective structures, FSS). The material parameter of the slab is in general bianisotropic, but the examples and the numerical computations show only isotropic materials. It is shown that there are three different categories of reso