The article is composed of three chapters, corresponding to the three discussed themes. The first chapter addresses the problem of the social science theory in the field of ethnic minorities, more specifically, then, it outlines the author's delimitation of three particular types of ethno-cultural communities in the other-ethnic milieu, which are: 1. ethno-enclave, 2. ethno-diaspora, 3. ethno-dispersion. The second chapter, which forms also a specific thematic bloc, deals with migration of the Czechs to Bulgaria, delineating of individual migratory waves and their basic specification, all of which is framed in the conceptual scheme set up in the previous chapter. In the last chapter, finally, the author discusses and analyses the most important factors influencing the contacts of ethnic communities both at the general level and applied to one particular case of the only Czech village in Bulgaria - Vojvodovo.
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