Search for: [Subject and Keywords = zbiory przybliżone] OR [Subject and Keywords = teoria zbiorów przybliżonych] OR [Subject and Keywords = informatyka teoretyczna] OR [Subject and Keywords = logika matematyczna] OR [Title = On a representation of rough sets by means of information systems] OR [Creator = Pawlak, Zdzisław] OR [Creator = Novotny, Miroslav]