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speak both Polish and Swedish. In his 2009 monography, Laskowski first presents their Polish-Swedish bilingualism, then gives a general description of their Polish, and finally focuses on an analysis of the process of acquisition of grammatical cases as a central category of Polish. The importance of Laskowski’s publications is defined by the fact that they are, so far, only such works about the acquisition of Polish outside of Poland. Laskowski is to be counted among the pioneers of research into Polish-foreign bilingualism.