@incollection{MEM_2020_49_a4,
     author = {Sendova, Evgenia and Vassileva, Albena and Kolev, Emil},
     title = {It is not about {\textquotedblleft}brain drain{\textquotedblright}, it is about {\textquotedblleft}brain gain{\textquotedblright} {\textendash} 20 years {High} {School} {Institute} of {Mathematics} and {Informatics}},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {31--47},
     year = {2020},
     volume = {49},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MEM_2020_49_a4/}
}