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Denev, Petko https://orcid.org/0000-0002-2290-791X

Todorova, Velichka https://orcid.org/0000-0003-0424-0565

Ognyanov, Manol https://orcid.org/0000-0002-5568-0854

Georgiev, Yordan https://orcid.org/0000-0002-3988-3256

Yanakieva, Irina

Tringovska, Ivanka https://orcid.org/0000-0003-1810-9824

Grozeva, Stanislava https://orcid.org/0000-0003-4025-7452

Kostova, Dimitrina https://orcid.org/0000-0002-9165-3060

Funding for this research was provided by:

Bulgarian National Science Fund (Grant DN06/4)

H2020 Spreading Excellence and Widening Participation (739582)

Text and Data Mining valid from 2019-06-04

Version of Record valid from 2019-06-04