Authors
Krzysztof Sas-Nowosielski
Poland
Andrzej Hadzik
Poland
Joanna Górna
Poland
© 2017 Krzysztof Sas-Nowosielski, Andrzej Hadzik, Joanna Górna, Małgorzata Grabara, published by University of Physical Education in Warsaw
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.