Povstenko, Yuriy http://orcid.org/0000-0002-7492-5394
Kyrylych, Tamara
Funding for this research was provided by:
Jan Dlugosz Univeristy in Czestochowa
Article History
Received: 19 November 2018
Accepted: 12 February 2019
First Online: 21 February 2019