Stoykova, E.
Blagoeva, B. http://orcid.org/0000-0002-7605-852X
Nazarova, D.
Nedelchev, L.
Nikova, T.
Berberova, N.
Kim, Y.-M.
Kang, H.-J.
Funding for this research was provided by:
Bulgarian National Science Fund (DН-08/13, DН-08/13)
Korea government - Ministry of Science and Information Technology (GK17C0200)
Korea government - Ministry of Science and Information Technology (GK17C0200)
Article History
Received: 13 October 2017
Accepted: 21 March 2018
First Online: 3 April 2018