@article{MEM_2020_49_a11,
     author = {Kelevedjiev, Emil and Branzov, Todor and Petrov, Petar and Shalamanov, Marin},
     title = {Bulgarian platform for competitions in informatics},
     journal = {Mathematics and Education in Mathematics},
     pages = {123--130},
     publisher = {mathdoc},
     volume = {49},
     year = {2020},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2020_49_a11/}
}