@incollection{MEM_2020_49_a30,
     author = {Slavtchova-Bojkova, Maroussia and Grigorova, Denitsa and Kamenov, Emil},
     title = {Data analysis and graphics using software},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {265--268},
     year = {2020},
     volume = {49},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2020_49_a30/}
}