SENDOVA, E.; VASSILEVA, A.; KOLEV, E. It is not about “brain drain”, it is about “brain gain” – 20 years High School Institute of Mathematics and Informatics. Mathematics and Education in Mathematics, [S. l.], v. 49, p. 31–47, 2020. Disponível em: https://smb.math.bas.bg/mem/index.php/memjournal/article/view/98. Acesso em: 7 oct. 2026.