@incollection{MEM_2020_49_a20,
     author = {Georgieva, Desislava},
     title = {Diagnostic assessment tools for determining the level of learners{\textquoteright} fraction skills},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {190--197},
     year = {2020},
     volume = {49},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2020_49_a20/}
}