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The Importance of Research and Development Expenditure for the Competitiveness of Manufacturing Enterprises in Poland. The Application of Panel Models

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Maria M. Grzelak
University of Lodz,Lodz, Poland
Iwona Laskowska
University of Lodz,Lodz, Poland
Elżbieta Roszko-Wójtowicz
University of Lodz,Lodz, Poland