@incollection{MEM_2020_49_a3,
     author = {Tonov, Ivan},
     title = {Chavdar {Lozanov} (1946 {\textendash} 2020)},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {26--27},
     year = {2020},
     volume = {49},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2020_49_a3/}
}