Authors
Magdalena Ulrichs
University of Lodz, Department of Econometrics, Faculty of Economics and Sociology, Rewolucji 1905 r. 41, 90-214, Łódź, Poland
© 2018 Magdalena Ulrichs, published by Poznań University of Economics and Business Press
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.