@incollection{MEM_2021_50_a26,
     author = {Georgieva, Penka and Dimova, Sonya},
     title = {Distance learning in 2020 {\textendash} from the first line: the experience of an elite high school},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {231--237},
     year = {2021},
     volume = {50},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2021_50_a26/}
}