"Sometimes there also strong demands for a better representation of national minorities in Parliament. In such cases, the electoral systems may facilitate the minority representation, for example, by the use of proportional representation systems in nation-wide or in large multi-member constituencies (without a high threshold of representation). But also PR list systems in small multi-member districts or even plurality/majority systems in single-member constituencies may ensure minority representation if the minorities are territorially concentrated. Also, the candidacy and voting form, among other things, may have an influence on minority representation. In some countries (e.g. Poland and Germany), there are “threshold exemptions” for candidates lists or parties presenting national minorities (see CDL-AD(2005)009, paras 35, 49) "
CoE (Venice Commission): Report on Electoral Law and Electoral Administration in Europe, para. 182

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Report on Electoral Law and Electoral Administration in Europe