@incollection{MEM_2021_50_a36,
     author = {Petrova, Stefana},
     title = {Overlap of the mathematical key competence with other competences},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {308--313},
     year = {2021},
     volume = {50},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2021_50_a36/}
}