The comparative analysis of challenges to the national education systems in Bulgaria and Ukraine (on the example of the tourism and IT sectors)Gesho Lyubenov, Oleksandr Zyma, Hanna Brusiltseva, Nadiya Dekhtyar and Nataliia PohudaSHS Web Conf., 104 (2021) 01005DOI: https://doi.org/10.1051/shsconf/202110401005