Szymczak, Czesław
Kujawa, Marcin http://orcid.org/0000-0002-1440-647X
Funding for this research was provided by:
Gdansk University of Technology
Article History
Received: 5 October 2018
Revised: 25 March 2019
First Online: 9 May 2019
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.