@incollection{MEM_2021_50_a32,
     author = {Ninova, Julia and Kadiev, Slavi},
     title = {Didactic technology for compiling a didactic system of problems},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {271--283},
     year = {2021},
     volume = {50},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2021_50_a32/}
}