Kovacheva, Zlatinka http://orcid.org/0000-0001-7401-3072
Naydenova, Ina http://orcid.org/0000-0002-9995-8299
Kaloyanova, Kalinka http://orcid.org/0000-0003-0222-7607
Poryazov, Stoyan http://orcid.org/0000-0002-1564-1551
Chapter History
First Online: 25 January 2023