@incollection{MEM_2022_51_a15,
     author = {Lazarov, Borislav and Vassileva, Albena},
     title = {The thirthieth issue of the {Chernorizets} {Hrabar} tournament {\textendash} junior division},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {184--189},
     year = {2022},
     volume = {51},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2022_51_a15/}
}